SUPPLEMENT TO THE ENGLISH MECHANIC,
MARCH 25, 1881.

Boat compressed air-motor for, 454, 501,
545, 570, 593; duplex, 523; model
screw, 407; motor for small, 374, 403;
sails, 20, 43

Bodies law of falling, 359; maximum
velocity of falling, 623

Bogie: carriage, long, 168; engines, 187,
259, 375

Boiled seaweed, 332

Boiler: 218, 240, 334, 429, 526, 597, 598,
617; capacity, 333, 404, 619; cement for,
264; coil, 170; copper, 265, 406; Cor-
nish, strength of, 169; explosion, Maid-
stone, 411; explosions, boilers and, 205,
565;-kitchen, 497, 519;-Trade-union
congress and, 173; gauge-glass, 333;
incrustation and anti-incrustators, 200;
lamp for model, 456, 550; model loco..
18, 41; model marine, 286, 405; one-
man engine and, 144, 166. 192; power,
597, 619; priming, 243, 263, 283, 311;
scale, 206; scurfing, 145, 167, 191, 243,
263; small, 382; the Duplex forced cir-
culation, 319; top, blacking for, 96, 120;
unused flued, 305, 358; upright, 526;
vertical. 190, 621

Boilers: 325, 427; and boiler explosions,
205; corrosion of, 329

Boiling: soap making without, 369; water
for 100 people, 310, 333, 356, 380, 405,
427

Borers, diamond, 74

Botany, study of, 490

Botanical specimens, 168

Bottom of the sea, seeing the, 494, 503
Boudet's microphone, 599
Bourdon pedal pipes, 548, 571
Bowls, turning, 358

Brains, physiological signs of, 195
Brake: Achard electric, 146: Clark and
Webb's chain, 37, 67; Clayton's vacuum
on Midland, 591; power, 244; removal
of Smith's vacuum from Midland, 301,
449; Stroudley's regulator for Westing-
house, 118; trials on the L. and Y.R.,
68; vacuum, 523; Westinghouse, 308,

620

Brake-power, 571

Brakes: continuous, 37, 67, 258, 280, 375,
472, 565, 591, 616;-in France, 401, 565;
Midland trains and, 522

Bramwell, Mr., on the patent laws and
technical education, 269
Brass: "and glass," 613; bronzing, 621;
plating type-metal with, 165; plating
with, 217, 441; rigidity of, 408; run-
ning, in name, 621; silvering, 94, 526,
516; taps, cleaning, 428
Brasswork: frosting, 122, 145, 167, 305,
351, 404; ornamenting, 94
Bread: reform, Dr. Gilbert on, 491; re-
form league, 149, 279, 379, 421; water in
crust and crumb of, 22
Bread-making in Spain, 82
Breaking of the voice, 145
reaking-weight of beams, 407
Breechloader, rust in, 286

Erewers: casks, cleaning, 285, 308; in-
struments, 242, 262, 306; licenses, 427
Brewing: 94, 310, 332, 355, 380, 427; water,
92, 242, 262
Brickmaking, 598
Bricks, 242, 309

Bridges, railway, lateral wind-pressure
and, 67

Fright machinery, 146, 168, 192, 216, 261
Bright's bells, 331

Brisbane, iron shipbuilding in, 592

Bristol expresses, Midland, 455

British Association, 4

Broken strings, 479, 502

Brompton, from Bloomsbury to, 9
Pronze: ancient use of iron and, 154;
casting, 167, 191, 354; French, 354
Bronzing brass ferrules, 621
Bubbles, soap, 431

Buckets, galvanised, 97

Building construction, 242; obstacle to,
594; society, 19

Bulloch's new biological microscope, 390
Bull's-eye lenses, 280, 308

Bunsen: battery, improvement of, 260;
cell, 575, 622

Burette, 90

Burner, Fletcher's gas-cooking, 3

Burners, Sugg's improvement in gas, 27
Bushmen, the crania of, 4

Buttermilk as food, drink, and medicine,

17

Buying out of the army, 479, 502
CAFFEINE, new process for extract-
ing, 324

Calculating machine, Babbage's, 70. 109
Calves, haust or worm in throat of, 121
Cameo oil-painting, 428

Camera: bellows body for, 18; obscura,
479, 502, 527, 574, 618; photographie,

154

Candelabra, cleaning, 167
Candle, the new pyrological, 52
Capacity, boiler, 333, 404
Capillarity, influence of in dyeing, 252
Carbines, rifled, 195

Carbon enlargements, 106; in iron, 540;
preparing battery, 550, 595
Carbonic acid in the air of ground, 369;
-making, 596, 618; anhydride, decom-
position of by magnesium, 181

Card-case, polishing, 311
Carferal, 285
Carriage: lamps, railway, 412; steam,
engine for light, 408; water, 221, 283,
307, 407

Carriages: long bogie, 168; new way of
working slip, 107

Cart: and wheel making, 366, 439, 485,
597, 606; wheels, heating tires for, 619
Cartes de visite in open, 285
Carving tools, 284
Case-hardened skates, 470
Casks, brewers', 285, 308
Cassegrain reflecting telescopes, 614
Casting: chilled roll, 231; great crucible
steel, 550

Castings: bronze, 167, 351; iron, 427;
spongy, 218; weight of, 454, 501, 522,
545, 593

Cast-steel, welding, 437, 465
Catalogue, Redhill, 539
Cats: as retrievers, 155; wounded, 335
Cavalry, volunteer, 262, 307, 380, 401
"Celestial objects," 11, 13, 207, 257. 298
Cells: bichromate, 92; Leclanché, 358
Cement for boiler, 264; for glass shade,
502; for oven-plate, 20; for terra-cotta,
287; for thermometer, 619; mixing lime
with, 18; oil-proof, 96, 120; Portland,
test for, 169

Centre of moon, 549, 572
Centrifugal pump, 308

Daniell cells, experiment with, 430
Dark spots on Jupiter, 158, 258, 303;
sun-glass, 256; systems, 59;-of the
Algol type, 109

Dark-room lantern, 573, 596
De Locht's pantelephone, 56
Deadening silver, 194, 218
Deal sawing. 120

Death, heat in body after, 310, 332, 355
Debilissima of Epsilon Lyræ, 207
Debts and goodwill, 405

Decay of a science, 494

Deception, a medium of, 9
Deciinal system, 544

Declination, sun's, 298, 348

aestheticism, 615; relations of metals,
395; theories, 495, 518
Clour-blind, spectra of the, 509
Colour-discs in Smyth's "Sidereal Chrom- Decoration, pottery, 484
atics," 516
Deed of gift, 594

Colouring: photos, 94; tin, 143
Colours: photography in natural. 359, 382,
569; Prof. Tyndall on, 204, 332, 355;
spectrum, 380

Defective: binocular, 406; sewing-ma-
chine, 263

Denning's bright spot, 446
Dentist's electro-motor, 191
Dephosphorising process, American view
of the, 435

Comet: 1880-I.. 11; a missing, 590, 613;
Cooper's, 495, 590; Hartwig's, 131, 157;
Pechule's, 422; Swift's, 278
Comets, origin of, 95, 143
Companions: to Epsilon Lyræ, 13: to Designing injector, 623
Polaris, 13, 85; to Vega, 9, 13
Compass: 527; tangent, 380
Compensated watches, 15
Complaint, liver, 97, 121, 166
Composite screw yacht, specification for,

Deposits, feed-water, 355

Depth-gauge, Sir W. Thomson's, 442

Constant battery, 265, 334
Constellations, study of the, 464
Continuous brakes: 37, 67, 258, 280, 375,
472, 565, 591, 616; in France, 401, 565;
in Scotland, 325
Cooking-stoves, gas, 406
Cooper's comet, 495, 590
Copper: boiler, 261, 406; coins, 119, 166;
in alloys, estimation of, 520; sulphate
of, 549, 572; tinning, 502

Copy of manuscript, 218, 261
Copying photograph, 598

Cornish boiler, strength of, 169

Coroner's inquest, 427

Correction collar, graduations on the, 467
Corrosion of boilers, 329

Cotton-seed hulls, use for, 552

Chuck: a grab, 78; eccentric, 91, 115, 139, Cotherstone cheese, 21

184
Cimbal, the, 374

Cinchona plantations, 155

Circular saw, power for, 597, 598, 620
Circulation, hot-water, 574, 618
Cistern, leaky water, 145, 167
Citric acid, synthesis of, 204
City and Guilds of London Institute, 108
Civil Service, Indian, 41
Clairvoyance: 18, 42, 70, 71, 93, 117, 188;
and transfer of thought, 115, 140; ex-
periments of Prof. Barrett, 145
Clams, 163

Clark and Webb's chain-brake, 37, 114
Clay, fungi and algae in London, 39
Clayton's vacuum brake on Midland, 591
Cleaning: charcoal filters, 332; engrav-
ings, 427; filagree, 284; old swords, 73,
119; scarlet uniform, 334; school desks,
46; white marble, 262, 263
Cleminson's flexible wheel-base carriages,

496

Clepsydræ for equatoreals, 207, 401, 422
Clerks, bank, 71
Clinometer, cheap, 447
Clip drum, 572
Clock church, striking hours on by elec-
tricity, 404; electric, 572, 595, 618; fluid
driving, 401, 422; gong, 595; noise in
264; pallets, 504; pendulum, 624;
pivots, 549 problem, 121, 167, 194; re-
gulator, solar, 9; sand, 207, 257, 265,
277, 300, 330, 355, 400, 422
Clockmaking, 261
Clock-motions, cheap equatorial, 182
Clockwork motion for boat, 383
Closet, fume, 330
Closet-traps. 242

Cloth, fastening on wood, 611
Cloth-reading, 475

Clond and fog producer, dust as, 411
Clutches, friction, transmission of power
by, 92

Coal: anthracite. 5; evaporative power of,
450, 501; peculiar, 8; working shallow,

407

Coal-gas: alcohol from, 549, 572; testing,
429, 475

Coal-mines: blasting in, 262, 283, 330, 104,
450, 474; explosions in, 125, 199, 220,
259, 333, 542, 591; fires in, 576
Coating laboratory tools, 281; for wooden
battery, 549, 595

Cock and foot holes, 574

Coil: induction, 42, 121, 333, 477, 478, 618;
intensity, 596; medical, 22, 39, 118
Coils, small, 50

Designs, selenite, 333, 356
Desks, cleaning, 46

Deviation of magnetic needle, 131
Devon safety bicycle, 472, 518, 543
Dew cap, 19

Dewing of the flat, 351, 398
D. H. G. to M. A., 212
Diabetes, 17, 71, 117

Diagrams, indicator, 41, 42, 70. 116, 118,
119, 141, 143, 165, 167, 190, 219, 238, 260,
261, 328, 351, 356, 376, 380, 519, 514, 573,
590

Dials, resilvering brass clock, 526
Dialysis, 74, 94

Dialyte telescope, 382
Diamond borers, 74
Diaphragm, Mayall's spiral, 558
Diaphragms, iris, 415
Dic-stock, improved, 153
Dies, tapping split, 264, 284, 307
Diet, 455, 476, 502

Difference engine, Babbage's, 157
Diffraction halo, 451

Digestion and temperature, 125
Dimensions of the stars, 109
Dining-table, bad-smelling, 331
Dipper, big, 278

Disc: Reese fusing, 153, 208, 235, 253,
257, 401, 424; rotating for live-cells, 278
Discovery of new planetary nebula, 256
Discs, glass, 422

Disease: germination of, 343; new, 552
Disengaging hooks, 286

Dishes, photographic, 242, 262
Disinfectants in scarlet fever, 624
Dissecting microscopes, 420
Dissolving view apparatus, Hughes's, 272
Distance: of a planet determined by its
transit over sun, 298; transmission of
power to a, 531

Distances, measurement of, by angles, 9,
21, 44

Distemper, an improved, 79

Dissolving views, electric light for, 621

Coupling automatic, 503, 524, 570; rods, Distilled water, 96, 120, 143

Crab, steam, 405

Cradle, electric, 22
Crania of bushmen, 4
Crape veil, 278, 421

Crater: double, N.W. of Fra Mauro, 157,
182; Marius, 494, 540, 563
Craters, lunar, 447, 494
Craze, metric, 423, 444

Creosote for furnace, 427
Cretaceous fossils, from S. of France, 59
Crewe, accident at, 590
Cribbage, 310, 332

Crookes's radiometer, 548, 595
Crosses, Queen Eleanor, 309
Crucible steel casting, a great, 550
Crystallisation of tin, 482

Crystals: natural, 94, 143; nitre, 329; py-
ramidal nitre, 120; snow, under micro-
scope, 208, 310, 331
Cube roots, 425
Cultivation, beetroot, 46, 94
Cupelling, 261

Cupola: 453, 521, 599, 619; foundry, 621
Curaçoa, 527

Curiosities of the voice, 129
Curious problem, a, 588, 597
Current measurement, 147
Curves: for an object-glass, 352; lamp-
shade, 598; railway wheels on, 220, 262,

283

Cutlery, table, 382

Cut-off in steam engines, most economical,

90

Cutter-bar and back-rest, 356
Cutters, section, 420

Cutting change-wheels, 623; screws, 22,
195, 219, 241, 597, 619; section, 95
Cycle, the "Ideal," 584, 616
Cycloids, aniline, 370
Cygni: Beta, faint stars near, 234, 277;
Delta, 11, 35, 303;-comes of, 256, 265
Cylinder, noise in, 218, 261, 281
Cylinders: lime, 23, 94; portable engine,
24, 380; removing grease from steam,
526

DAMAGE by fowls, 17
Damask, weaving, 286
Damp walls, 309

Damper and lever hinges of piano, 218
Dan Quarle, 455

Dogs, how do they find their way? 284
Dolls, 501

Dome of Vienna observatory, 251
Domestic: animals, homeopathic treat-
ment of, 95; labour-saving machine
116; motors, 25;-Ericsson's, 129
Donkey-man, 453, 475, 522

Doors, draught-stopping for, 238
Double crater, N.W. of Fra Mauro, 157;
star near Jupiter, 131; stars, 12;-hand-
book of, addendum to the, 396, 446
Double-edged tools, 13, 66, 160
Down-draught in large hall, 356
Draught, 263

Draught-stopping for doors, 238
Drawing: centres for use with compasses,
146, 168, 192, 217; groups of stars, 50,
94; mechanical, 241, 282, 354; of caturn,
421, 444; pen, Sprenger's patent, 9; with
the microscope, 420

Dressing: skins, 334; tarpaulins, 527
Dried plants, 19

Drill, 194, 219

Drilling apparatus, 479, 550, 622
Drills: mounting in lathe, 236; twist,
423, 427

Drinks, intoxicating, 479, 502
Driving belts, 193, 240, 281, 305;-crossed,
359; clocks, fluid, 401, 422; clocks, sand,
207, 257, 265, 277, 300, 330, 355, 400, 422
Drowning, apparent, 283, 330
Drum, clip, 572

Du Motay's last invention, 50
Duplex boat, 523; express engine, 375;
forced circulation boiler, 319
Dust as cloud and fog producer, 411
Duties, executors, 218

Duty, United States. 451, 521
Dye, new vegetable, 253

Dyeing and curling ostrich feathers, 210;
influence of capillarity in, 252; plumes,
261; silk, 558; straw, 220
Dynamo, Edison's new, 509
Dynamo-machines, small, 352
Dynamometer: Colladon's, 2580;
transmission, 607
Dyspepsia, 20, 43, 72, 142, 190

simple

EARTH, sun's distance from the, 502
Ebonised and gold furniture, 165, 168, 192
Ebonising wickerwork furniture, 168
Ebonite: 42; plates, 18; polishing, 165

MECHANIC

Eccentric: 431: chuck, 91, 115, 139, 181
Eclipse: 207, 261; solar, 422
Economy: feed water, 623; of working
steam expansively, 621
Edison's: anesthetic, 79;-and the Lancet,
180; electric lamp, 154;-pen, 312, 356;
electric railway economically considered,
343; new dynamo, 509
Education: agricultural, 5; Mr. Bram-
well on technical, 269; Prof. Huxley on
scientific, 104

Effects of lightning, remarkable, 107
Eighty miles an hour, loco. to run, 329
Eleanor, Queen, crosses, 309
Electric: adhesion of metal contacts, 275;
apparatus, medical, 478, 548; arc, 308;
bell, faulty, 265, 285;-indicator for, 428,
452: bells, 596; brake, Achard, 146;
clock, 572, 595, 618; conductibility of
liquids, 310, 331; cradle, 22; discharge,
in insulating liquids, 584;-in rarefied
gases, 57; expansion, 31; gas-lighting,
261; lamp, Edison's, 154;-Swan's, 3;-
Werdermann's, 311, 383, 451, 474; lamp-
lighter. 194, 219; lighting, 155, 179;
machine, plate, 309, 431, 620; motor,
the new, 387, 424;-Trouvé's, 415, 479.
302; pen, Edison's, 312, 356; railway,
Edison's, economically considered, 343;
telegraph, 17

Electric light: 191, 455; at Glasgow, 248;
battery for, 574; for City of London,
269; for dissolving views, 621; for gig-
lamps, 18; in navy, 423; industrial uses
of the, 77
Electrical:

engine, 305; lamplighter,
194, 219; machine, 191, 219, 240;-plate,
431, 620;-Winter ring to, 216; specific
inductive capacity, 311
Electricity: 357, 431; as power, light, and
heat, 491; firing shots by, 194; heating
by, Dr. Siemens on, 555; influence of,
on vegetation. 244; medical, 21, 121,
137, 144, 185; Paris exhibition of, 372;
striking hours on church clock by, 404
Electro-brass plating, 441

Electro-dynamic paradox, 74
Electro-generator, 193

Electrolytic determination of silver, 103
Electro-magnetic: machine, 191; units,

194, 261

Electro-magnetising, 527, 547
Electro-magnets, 19, 42, 311
Electro-metallurgy, 558

Electro-motor: 423, 478, 527, 546; den-
tist's, 191; improved, Wiesendanger's,
; Trouvé's, 415

Electro-motors, their principles and con-
struction, 520, 527
Electrophone, Maiche's, 276

Electro-plate, finishing, 121, 146, 167
Electro-silvering, 558

Elementary mathematical optics, 212, 402,
498, 616

Elevating mandril, 326

Elliptic turning, 306
Embroidery patterns, 501
Enamelled glass, white, 593

Endowment: of research, 348, 587, 613; re-
search for, 494, 539; Royal Astronomical
Society and, 590

Energy of yeast, potential, 540
Enfaced paper, Indian, 144
Engine: agricultural, 430; and boiler,
one-man, 144, 166, 192; Babbage's cal-
culating, 109-difference, 157; conden-
sing, 594; double cylinder, 518; elec-
trical, 305; expansive working of, 96;
express. Duplex, 375; for canoe, 311;
for light steam-carriage, 408; gas, 168,
266, 30, 355, 407, 471, 614; gunpowder,
328; hauling, 620; horizontal, 220; hot-
air, 264; jerky, 308; lamp for, 456;
launch, 266, 308, 330; limitations of the
team, 2; marine, model, 405, 504, 599;
Midland express, No. 97, 165; model,
287, 550; one-horse, 287; Perkins' in
United States, 344; portable, cylinders
of, 284, 380; power of, 430, 451; pump-
ing, 620; query, 241, 355, 359, 383, 429,
517, 593; simple single-acting, 393;
slide-valve of horizontal, 455, 522. 594;
small half-horse, 265; traction, 287, 309
Engine-drivers v. engine-spoilers, 565
Engine-driving life, 364

Engineer and volunteer corps, 283
Engineering exhibitions, 275
Engines: air-pump for, 41; bogie, 187,
250, 375; express on L. and S. W., 401;
Glas tow and S. W., 301; G. W. R., 211;
hauling, size of, 406, 451, 620; horizontal,
242; leading wheels of, 13; L. and N. W.
73, 145, 169, 238, 243, 263, 285, 311, 333,
555; L. and S.W., 523; L. and Y. Bogie
express, 259; L. C. and D., 263; new
Midland express, 595; S. E., 594; speeds
of, 504; winding, 406, 451
English French, and Prussians, alleged
physical differences of, 550; tin-workers
in America, 69; watches, rates of, 138;
-V. American, 91
Engraving, cleaning, 427
Enlargements, carbon, 106
Entomology: 95, 220; Sir J. Lubbock on,

491

Eozoon Canadense, organic nature of, 31
Ephemerides, 17th century, 539
Equation of equal altitudes, 298, 569
Equatore: adjusting, 207, 219, 241: al-
tazimuth, 36, 59, 110, 157, 182, 207, 256
Equatoreals, sand driving-clocks and
Clepsydre for, 207, 330, 355
Equatorial: circles, 299; clock-motions,

cheap. 182; stand, new, 296
Equinox, vernal, 298, 333

Equulei: Beta, 356, 451; Herschel I., 62,

568

Erasure of Prussian blue, chemical, 599
Ericine, new vegetable dye, 253
Ericsson's domestic motor, 129
Escapement, planting the, 565
Estates in Chancery, 41, 190
Estimation of copper in alloys, 521; of
soda, 139, 167

Etching: glass tubes, 22; on glass, 408, 429
Etho-oxygen limelight, 609
Evaporation, 406

Evaporative power of coal, 450, 501
Evolution: 187; of satellites, 445, 515,
568; Prof. Huxley on, 393
Examinations: 73; physics, 18; physio-
logical, 571, 572; questions for, 619;
science, 72

Executor's duties, 18, 218
Exhibition engineering, 275; Richmond
Industrial and Fine Art, 592; Turner's,

149

Express: engine, Duplex, 375; engines
on L. and S.W., 401; locomotive, new
American, 557; trains, 114, 139, 187,
211

Expresses: American, 237; Midland Bris-
tol, 455
Eye, work on the, 539, 548, 571
Eyepiece astro, 311; for refractor, 298;
Prof. Abbé's stereoscopic, 300, 323
Eyepieces: 257, 278; achiomatism of, 468,
566, 592, 613; astronomical, 9, 72, 157,
298; Huyghenian and other, 398; peri-
scopic, 495, 516; refractor, 310, 331;
telescope, 9, 44, 60, 109; terrestrial, 595;
testing, 216
Eyes, the, 191
Eyesight, 146, 168

Ferrules, bronzing brass, 621
Ferry-boat, the largest, 614
Fiddler: on soundboards, 85, 304; on
vibrations, 38, 86
Field-glass, 19, 42
Fifteen puzzle, guide to the, 129
Figure-skating, 527, 547
Filagree, cleaning, 284
Filters, cleaning charcoal, 332
Fining malt liquors, 217, 261
Finishing electro-plate, 121, 145, 167
Fire, hayricks taking, 71
Fireball, brilliant, 324
Fire-bars, straightening, 145, 216
Fire-damp indicator, Ansell's, 304, 377
Fires in coal-mines, 574
First-class objectives, 420
Fishermen, helps for rambling, 303
Fishery Acts, the, 216

Fishes and the lime in water, 129
Fixed stars, southing of, 298
Flames, coloured spirit, 243
Flat: dewing of the, 351, 398; for New-
tonian, size of, 824, 373, 422, 417, 517;
roof, 431
Fleas, 380

Fletcher's gas cooking-burner, 3
Flexible sandstone, 140, 157, 212
Flight: aerial, 61, 88, 112, 134, 160, 556;

and flying, 185; mechanics of bird,
394; of birds, 14, 38, 66, 68, 86, 111, 112,
134, 158, 159, 186, 213, 279
Flint and its formation, 194, 207, 218
Floor, hall, 549
Flour-bin, protecting, 264
Flour-mill hoists, 286
Flower trick, Singalese, 92
Flower-pots, 594

Flue, greenhouse, 220, 242

Fog: and smoke, and Siemens' stove, 247;
area, London, 311, 356; cloud and dust
as producers of, 411

Fogs, London, and smoke prevention, 339
Food, work and, 179
Footpaths, tar, 117
Foot-valve, 549

Foraminifera, collecting living, 128
Force: electromotive, 20; is inertia a?
170, 193: of projectile, 479, 523, 570,
594; retarding, 550
Formations, lunar, 398
Formic acid, 546

Formula for achromatic o.g., 444
Fossils: cretaceous, from the S. of France,
59; preparing, 82, 396
Foundry cupola, 599, 621
Fowls, damage by, 17

Fra Mauro, double crater, N.W. of, 157,

182

Frames: arithmetical, 550; gilt, 479, 502
France, continuous brakes in, 401, 565
Free reeds in organs, 334
Freezing-points of watered alcohol, 252
French bronze, 354; polishing, 41, 45,
72, 175, 227;-in lathe, 406; royalty in
Westminster Abbey, 310
Fret-cutting and scroll-sawing, 603
Fretwork, 73

Friction: clutches, transmission of power
by, 93; train, 182, 219; water-pressure
and, 478
Frost, protecting pipes from, 146, 264
Frosting brasswork, 122, 145, 106, 305, 354,

404

Frosty weather, plants and, 575
Frozen reservoirs, 573
Fruit salt, 97, 121, 166
Fuel, consolidated, 101, 163
Fume closet, 330
Fumes, sulphur, 522
Fungi and algae in the London clay, 39
Furnace, gas, 407, 477, 502, 5.3
Furniture: ebonised and gold, 165, 168,
192; ebonising wickerwork, 168
Fusing disc, Reese, 153, 208, 238, 253,
257, 401, 424; metal, 310

GALENISING process

Good-bye to medal funds at R.M.S., 467
Goods waggons, carrying capacity of, 370
Good will, debts and, 405

Gout: 287; in the hands, 21, 144
Governor gas, 96, 120; Napier's, 103
Gower telephone, the new, 509
Gower-Bell telephone, 476
Grab chuck, a, 78

Graduations on the correction collar, 437
Grants made by council of B.A., 6
Grass, leaching, 355

Grate, the Wonderful, 586
Gravestone in Africa, 219, 479, 502, 522
Gravitation, alteration of, 545
Gravity: specific, 406, 470, 515;—of silver,

65

Grease in horse, 502; removing from
steam cylinders, 526

Great Eastern locomotives, 520, 549, 505
Great Western engines. 211
Greenhouse: flue, 220, 242; portable, 191
Gregorian reflector, 165, 429, 451
Gresham lectures, 244, 610
Grinding: circular saws, 45; lens, 69, 127
Grindstone: holding tools to, 137, 212,
mounting, 37

Grindstones, dangers of, 433
Grisoumeter, the Phanaro, 21
Ground: carbonic acid in the air of, 369;
hail and configuration of, 578; shaking
of, 548, 595

Growth: of plant stems, daily periodicity
in the, 7; plant, 20, 43, 72, 91, 142, 165,

215

Gundlach's objectives, 612
Gunpowder engine, 328
Gunsmith's tools, 593

Guttapercha: industries, indiarubber and,
30. 54, 80; lining acid-bath with, 220,
211

HAIL and the configuration of ground,

578

Hailstones, conformation of, 378
Hall: floor, 549; seating of, 620

Halo: diffraction, 451; moon's ring or,
147, 217; or defective eyesight, 384
Halstead's incubator, 141

of Prof. Handbook of double stars, addendum to
the, 396, 446
Hand-pump, 357

Emerson Reynolds, the, 203
Galvanised buckets, 97
Gas: alcohol from coal, 572; and cold
weather, 525, 544, 571; and coke stove,
Siemens's. 291; benzoline, 401, 449, 469,
497, 513, 548, 563, 622; burner, street,
334, 356;-Siemens' regenerative, 532;
burners, 281;- removing, 310;-Sugg's
improvements in, 27; by a cold process,
481; cooking burner, Fletcher's, 3;
cooking stoves, 406; furnace, 407, 477,
523; governor, 96, 120; heating by, 177,
549; new, 504; new water, 154; pres-
sure of, 121, 144; pressure, volume, and
temperature, 356; purification, chemis-
try of, 170, 192; soldering iron, 220;
vessels for compressed, 454
Gas-bags, lantern, 623

Hands, gout in the, 21, 144
Handy blowpipe arrangement, 353
Hardening: steel saws, 167; steel tools,
547, 548; vice-jaws, 334
Harmonium: 429; percussion action, 561;
reeds, 45, 118, 142, 165
Harmonograph, 359, 382, 405
Hartnack's objectives, 612
Hartwig's comet, 131, 157
Harvard College Observatory, report of
the, 588

Hat, cleaning felt, 355

Hauling engines, size of, 406, 451, 620
Haust or worm in throat of calves, 121
Hayricks taking fire, 71
Head of pressure, 454

Gas-engine, 168, 266, 308, 331, 355, 407, Health, clothing in its relation to, 319

471, 614

Gaseous satellite of Jupiter, 207
Gases: action of, on reflecting surfaces,
441; electric discharge in rarefied, 57;
radiant heat and, Prof. Tyndall on, 579;
velocity of sound in, 129
Gaslights, white, 312, 356, 478
Gas-lighting, electric, 264
Gas-liquor test, 94, 119
Gauge: depth, Sir W. Thomson's new,
442; joints of water, 453: new way of
lighting water, on L. and N W. engines,
301; Waltham watch, 304, 353
Gauge-glass for model boiler, 333
Gear, reversing, 358
Gelatine: and chrome-alum, 56; positive
transparencies for lantern, 359
Geneva barrel, mainspring in, 243, 263
Geographical position of Orgères, 517;
societies, 530

Geological: 46, 109, 243, 283; and minera-
logical, 207; and mining books, 617;
survey, 70
Geology: 473; experimental,
Wiltshire, 499
German beer, 593

Germination of disease, 343
Germs, ague, 358
Gift, deed of, 594
Gilbert, Dr., on bread reform, 491
Gilding, 195

316; of

Gilt frames, 479, 502, 523
Glacier-ice, optical structure of, 556
Glasgow and S.W. express engines, 301;
-steam reversing gear, 382; electric
light trials at, 248
Glass: artificial horizon, black, 256; bend-
ing, 121; "brass and," 613; coating
steel with, 281; discs, 422; effect of
heat upon, 321; et hing, 22, 408, 429;
properties of, 353, 378; roofing, Rendle's
acme" system of, 103; shade, cement
for, 502; silvering, 516; sweating of,
221; tank, 407, 428; vignette, 574, 596;
white enamelled, 593
Glasses, concave, 549, 572, 595

Fluid, resistance to plane moving in a, Globes, varnishing, 95, 120

Healthiness of a house, 598
Heart, and truss for hernia, 121
Heat: 18, 121, 167; and gases, radiant,
Prof. Tyndall on, 579; and motion. 157,
169, 192, 217; effect of upon glass, 321;
electricity as power, light, and, 491; in
body after death, 310, 332, 355; me-
chanical theory of, high speeds and the,
508; protecting pearls from, 96; regu-
lator for high temperatures, 494; undu-
latory theory of light and, 455, 477
Heathorn's steering gear, 332
Heating: by electricity, Dr. Siemens on,
555; by gas, 177, 549; by steam, 306;
chapel, 220, 242, 281, 329, 354, 379;
churches, 192, 217; oven, 220; tires for
cart-wheels, 597, 619; water, 96, 120,

265

Helps for rambling fishermen, 303
Hercules, nebula in field of great cluster
in, 11

Herculis, Zeta, 59, 85, 109, 233, 256, 278
Hermetically sealed tins, 17, 238
Herschel I. 62 Equulei, 568
Herz telephone, 584

High and low pressure, 335, 593; powers,
focussing with, 420; speeds and mechani-
cal theory of heat, 505; temperatures,
ice at, 204

Hints on mounting, 320
Hire of sewing machine, 190
History of the steam-engine, 507
Hoddesdon organ, 22, 45
Hodograph, the, 374
Hoist, 406

Hoists, flour-mill, 286
Holes, cock and foot, 574
Hollow: shafts, strength of, 93; wall, 623
Holman's new compressorium and moist
chamber, 57

Holtz machines, 137
Holtzapffel's" Mechanical Manipulation,"
588,598

Homogeneous immersion: 1-12th, Powell
and Lealand's new, 183; object-glasses,

300

Honeysuckle, cultivation of 191
Hook, disengaging, 286
Horizon, black glass artificial, 256, 265,
298

Horizontal engine: 220; slide-valve of,
455, 502, 522, 570, 594
Horse, grease in, 502
Horse-power: 430, 451, 452, 503; man-
power and, 599, 621
Hot-air engine, 264

Hot-water: circulation, 574, 618; pipes,
paint for, 450, 455

ICE: at high temperatures, 704; craters,
lunar, 494; in winding shaft, 407, 593;
making. Du Motay's process of, 50; op-
tical structure of glacier, 556; ranges,
circular, 417

"Ideal" cycle, the, 584, 616
Ideas, bicycle, 17
Idiot legatee, 221
Illuminated sky, 37
Illumination: and objectives, microscopic,
368; lantern, 17; oblique by swinging
substage, 183; of opaque objects, 84
Illuminator: for opaque objects, Tolles's
interior, 295; Woodward's oblique, 233
"Illustrated" astronomy for the mil-
lion, 348

Image, correction of curvature of slit, 566
Imagery, ment 1, 6

Immersion lenses: 300; Powell and Lea-
laud's new 1-12 oil, 84

Impulsion, attrac ion and, 449, 615

Lamp: 218; electric, Edison's, 154;-
Swan's, 8, 334;-Werdermann's, 311, 383,

475

Lamplighter, electric, 194
Lamps: microscope, 420; railway carriage
roof, 412

Lancashire and Yorkshire railway bogie
express, 259; brake trials on, 68
Lancet, Mr. Edison and the, 180
Land: property in, 20; surveying, prac-
tical, 598, 621

Language, use and abuse of, 252
Lantern: condenser, 547; dark-room, 578,
596; gas-bags, 623; gelatine films for,
598;-positive transparencies for, 359;
glasses, 568; illumination, 17, 549; ka-
leidoscope, 453; lens, 359, 620; optics
with the, 201, 238, 249, 293, 340, 856, 391,
431, 438, 486, 533, 566, 582; photo-lens
in, 121, 191; slide on curtain, 382; slide
transters, 573, 596; transparencies, 498,

573

Lapidary's work, 380
Larvae, preserving, 478

Impurities in muriate of zinc, &c., 431, Laryngoscope, 241
433

Inaccessible object, distance of, 44
Inclines, 80, 572

Incrustations, boiler, 200

Incubator, Halstead's, 141

Indentures, apprentices', 624

Indian Civil Service, 41; enfaced paper,
144; Government paper, 22
Indiarubber: and guttapercha industries,
30, 54, 80; solution, 121
Indicator: Ansell's fire-damp, 304, 377;
diagrams, 41, 42, 70, 116, 118, 119, 141,
143, 165, 167, 190, 190, 219, 238, 260, 261,
281, 328, 354, 356, 376, 519, 544, 590; for
electric bell, 428, 452; Stromeyer's
strain, 177

Indicators, speed, 570
Indigo, synthesis of, 537
Induction: coil, 42, 333, 477, 618;--core,
478; machines, 3-3, 423
Industrial uses of the electric light, 77
Inertia: is it a force, 157, 170, 193;
moment of, 263, 284

Infection in the air, organic matter and,
173

Infinities, books on, 588, 595, 618
Inhaling oxygen, effects of, 74
Injector, 407, 455, 525; designing, 623
Ink: aniline, 279, 286; chromograph, 527;
pads for rubber stamps, 575
Inkstand, Warman's improved cone, 394
Inland revenue office, 96, 120
Insulating liquids, the electric discharge
in, 584

Lassell, the late Mr. W., 157
Lathe: 73, 309, 357, 614; bar, 170; bed,
455; cheap, 504, 524; chucks, fast, 622;
driver, 570; fly-wheel and treadle, 13;
mandril, 624; matters, 326, 333; mount-
ing drills in, 236; polishing in, French,
406; screw-cutting, 21, 45; speed, and
treadle, 169

Laths, painting, 524

Launch engine, 308, 330; screw, 334,
380; steam, 310, 329, 356, 546, 573
Law: books, 45, 190; coroner's, 427;
Kepler's third, 157; of falling bodies,
348, 359

Lawyer's bill, heavy, 18
Lax, Norwegian, 74
Leading wheels in engine. 13
League, the bread reform, 149, 279, 379, 424
Leaky water cistern, 145
Leather: new system of tanning, 57;
sticky American, 168
Leaves, skeletons, 194
Leclanché: battery, 221, 243, 261, 306,
358, 549, 572; cheap, 548, 595
Lectures, popular scientific, 460
Leeds accident, the, 449, 497, 519, 541
Legacy duty and adoption, 405
Legal: 190, 217, 243, 265, 283, 285, 331,
404, 427, 428, 594, 596; proof of birth,
121, 166, 216
Legatee, idiot, 221
Legible shorthand, 614
Lens: Barlow, 22, 78; focal length of,
358, 381, 621; for telescope, 573, 595;
grinding, 69, 94, 137, 138; portrait, 359
Lenses: extra front to Powell and Lea-
land's new 1-12th, 233; photographic,

lodide: of nitrogen, 139; of starch. 218; Leyden jars, 170, 217

Joke, an effective practical, 578
Joulad unit, the, 503

Joy's (so-called) valve-gear, 70
Jupiter: 11, 35, 37, 84, 110, 131, 183, 234,
253, 304, 421, 446, 468, 563; approach of
to fixed star, 276; Barnard's spot, 421;
belts of, 157; black spots on, 210, 234,
258, 30, 421; double star near, 131;
gaseous satellite of, 207; great spot,
59; light of Saturn and, 59;
new spots on, 11; observations of, 373;
el sp ton, 131, 27, 324, 398, 444, 468;
satellites of, 145, 157, 348; spot on, 39;
the markings on, 131, 132, 276, 302, 324,
348, 407; Venus, and Saturn, 540, 563,
588, 589; white spot on, 277, 302, 324,
350, 370, 421, 422, 468

Line, telegraph, 97
Links for model valve-gear, 116
Liquefied ozone, 140

Liquid substances, how to use the po-
lariscope in, 366; two solids making a,

91

Liquids, electric conductibility of, 310,

331

Liquors, fining for malt, 217
Livadia, the, 129
Live-cell: a new, 542; rotating disc for,

278

Liver complaint, 97, 121, 144, 166, 191,

239

Load on beam, 573, 595
Local boards, 73, 190
Locomotive: a queer, 83; boiler, model,
18, 41, 573; G.E.R., 20, 549; model,
147, 217, 308, 331, 355, 525, 623; - speed
of, 220; new American express, 557; to
run 80 miles an hour, 329; wheels,
slipping of, 70, 92, 166
Locomotives: American, new, 223;

G.E.R., 595: new, 574, 596
Logarithmic slide, the, 559, 592
London: and N.W. engines, 73, 145, 167,
238, 243, 263, 283, 285, 309, 311, 331, 355;
and 8.W. new express engines, 401, 523;
Chatham and Dover engines, 263; clay,
fungi and algo in, 39; electric light and
the city of, 269; fog area, 311, 356; fogs
and smoke prevention, 339; university,
B.Sc. Exam., 623
Loom pickers, 451
Lubbock, Sir John, on entomology, 491
Luminous sensibility in the retina, varia-
tions of, 417

Lunar: crater Marius, 494, 563; craters,
447, 494; formations, 398; micrometer,
Neison's, 539; theory, the, 256, 286,

298

Lyra, comites to epsilon, 13; debilissima
of epsilon, 207

MACHINE: Babbage's calculating,
70; electrical, 191, 219, 240; electro-
magnetic, 191; induction, 423; magneto-
electric, 310, 325, 470; new domestic
labour-saving. 116; new telegraph, 151;
plate, electrical, 287, 308, 431, 620
Machine-made watches, 236, 325
Machinery: bleachworks, 455; bootmaking
by, 152: bright, 146, 168, 192, 216, 261;
watchmaking by, 69, 114, 225
Machines: Holtz, 137; induction, 383;
milking, 41; mowing and reaping, 236;
printing, 17, 71; small dynamo, 382
Magic mirrors, on, 511
Magic-lantern: 549, 568, 598, 620; con-
densers, 374; gelatine for, 598, 620;
lenses, 381; photos for, 454; simple,
535: slides, 375
Magic-lanterns: 39, 220, 242, 359; scien-
tific slides for, 253
Magnesia, lime and, 598, 620
Magnesium: decomposition of carbonic
auhydride by, 181; in the sun, 296
Magnetic: 423; attraction in iron ships,
9, 17; needle, deviation of the, 131;
plumbago, 597

Magnetism: connection between sunspots
and terrestrial, 348; medical uses of,
387

Magneto-electric machine, 310
Magneto-machines: best form of magnet
for, 32; for medical purposes, 325, 470
Magnets: best form of for magneto-ma-
chines, 32; electro, 19, 42; permanent,
504, 527

Magnifications in America, prodigious,

84

Magnitudes, star, graduation of, 9
Mahogany, polishing, 73
Maiche's electrophone, 276
Maidstone boiler explosion, 411
Mainspring in Geneva barrel, 244, 263
Malt: extract, 334; liquors, fining of,

217

Man power, horse and, 599, 621
Library: a, 265; national circulating, 37, Mandril: angle of lathe, 623; elevating,
136; Ronald's, 433
Licenses, brewer's, 427

326; traversing, 264, 285
Manipulation, microscopical, 233

Mechanical: drawing, 241, 282, 354; mani-
pulation, Holtzapffel's, 588, 598; singing
bird, 39, 92. 136, 211, 280, 331; stage,
Watson's, 605; theory of heat, high
speeds and the, 5'8

Mechanics' almanac, Calvert's, 370
Mechanics of bird flight, 894

Medal endowments at the Royal Micro-
scopical Society: 212; good-bye to, 467
Medical: coil, 22, 89, 118; electrical appa-
ratus, 478, 548; electricity, 21, 121, 137,
144, 185; microscope, Parke's, 343; mie-
sionaries, 169; purposes, magneto-m-
chines for, 825, 470; uses of magnetism,
587

Meerschaum, colouring, 356
Melting, 95, 143, 165

Mental: imagery, 6; powers of the lower
animals, 228

Mercury, sulphate of, battery, 406, 423
Meridian line, 623
Metal: contacts, electric adhesion of, 275;
fusing, 310; plate, sounding, 167;
speculum, 122: turning tools for, 356
Metalloids, spectra of, 32

Metals: colour relations of, 395; malle-
ability and ductility of, 18
Meteor: briliant, 110; large, 256, 277; of
Oct. 1. 158; of Nov. 2, 277, 298
Meteor-shower, January, 398
Meteors, 350

Metric: craze, 423, 444; system, 996. 423,
448;-Mr. Coleman Sellers on the, 340
Micrometer: Neison's lunar, 539; what
sort of a, 588

Micrometers: 353; and equatorial circles,

299

Microphone: Boudet's, 601; Strangway's,

22

Microscope: binocular, 504; binocular,
full aperture prism for the, 278; Bul-
loch's new biological, 390; compound,
194, 308; diaphragm, 524; drawing with
the, 420; eyepieces, 503, 546; in writing,
55; lamps, 420; lenses, 240, 243, 264,
281, 286; medical, Parke's, 343; rota-
ting dise for live-cell of, 278; snow
crystals under the, 298; swinging sub-
stage for the, 582; Wale's, 323; Wat-
son's improved, 487;-new mechanical
and rotating stage, 605
Microscopes: dissecting, 420; monocular
and binocular, 421; students' and cheap
optical work, 323

Microscopic; 84; mounting, 591; objects.
illumination, and objectives, 368; tec-
tions, 286, 335
Microscopical: 115, 210, 429, 448, 452, 468,
495, 501, 517, 541, 563, 591, 612;
amplification, 574, 618; examina-
tion of blood, 503;-of a plant, 607;
manipulation, 233; measurements, 241;
Society, medal endowments at, 211, 467;-
Prof. Abbé's stereoscopic eyepiece at, 300
Microscopists, recipes for, 441
Microscopy, American, 562
Midland and G. W. trains, 161; Bristol
expresses, 455, 477; express engine, 165,
595; railway, 22, 118, 190;-and brakes,
522;-Clayton's vacuum brake on, 591;
trains, removal of Smith's vacuum brake
from, 301, 449

Mildew on ferns in case, 167, 191
Mildewed tobacco, 193
Milk analysis, 279; condensed, improved
manufacture of, 296; goats', 379; test-
ing for water, 189
Milking machines, 41
Million: "illustrated" astronomy for the,
348; years, a, 417
Millstone, fly-wheel and, 617
Mineral water: iron in, 139; qualitative
analysis of a, 65, 215, 281
Mineralogical, geological and, 207
Mines, explosions in, 199, 259
Mining: 74, 142; books, geological and, 617
Minute objects, on the visibility of in
various media, 32

Mines: blasting in coal, 283, 450, 474; ex-
plosion in coal, preventing, 542, 591; fires
in coal, 576

Mirror, mounting 12in., 471
Mirrors, magic, 511
Missing comet, 590, 613

Life and death of a world, 6; problem Manure: artificial, 573; seaweed for, 91; Missionaries, medical, 169
of, 81

Lift, experiment with a, 482
Lifting power, 475, 478
Light: artificial actinic, 335; artificial,
fatigue experienced in reading by, 212;
chemical and photo. action of, 274;
electric, 455;-for city of London, 269;
-for gig-lamps, 18; for colonial travel-
lers, 217; monochromatic, 562; of Jupi-
ter and Saturn, 59, 95; preducing sound
by, 49; speed of, 333; trials of electric,
at Glasgow, 248; undulatory theory of,
455, 477; velocity of, ascertaining and
recording the, 33, 59, 348; zodiacal, 351
Lighting: electric, 155;-progress of,
179; gas, electric, 264; shop-window,
334, 356, 380; water-gauge on L. and
N.W. engines, 301
Lightning. ascending, 37; increase of
risk from, 578; remarkable effects of,
107

Lightning-conductors: on the necessity
for a regular inspection of, 7; testing,

571

Lille, accident at, 13, 38, 89, 139
Lime: bisulphite of, 377, 381; cylinders,
23, 94; in water fishes and the, 129;
magnesia and, 598, 620; testing for,
334; with cement, mixing, 18
Limelight: 146, 169, 216, 217; the
oxygen, 609

valuation of, 170, 188
Manuscript, copy of, 218, 261
Maps and atlases on false projections, 566,

614

Marble: cleaning white, 262, 263; monu-
mental, 261; turning, 408

Marine boiler, model, 286, 311, 405, 504,

599

Mnemonics, 503, 571, 617
Model: address, 207; boat, clockwork for,
383; boiler, lamp for, 456; marine,
286, 311, 405; engine, 287; gauge-glass,
333; launch, 546; link gear, 116; loco.
boiler, 18, 41, 147, 308; locomotive, 219,
220, 331, 355, 623; one-man engine and
boiler, 144, 166, 192; ship, 74; steamboat
243, 284, 307

Marius, lunar crater, 494, 540, 563
Markings on Jupiter, 132, 211, 276, 302, Molineux action, substituting a, 264
824, 348
Married women's property, 405
Mars, occultation of, 588
Masts of model yacht, 244, 263, 284, 307
Mathematical: bees, 69; optics, elemen-
tary, 212, 402, 498, 616
Matter, "Aletheus
on, 89
Matters, lathe, 826
Mayall's spiral diaphragm for oblique
illumination, 558
M'Culloch, thanks from Mr. 39
Meal powder, 382, 406, 428
Mean free path of atoms, 17
Meanings, word, 95, 143
Measure, tables for square, 333
Measurement: current, 147; of distances
by angles, 9, 21; of minute thicknesses,
183, 300; of ship's bottom, 404; thermal,
444

Moon: 515; ring or halo, 217; transit of
centre derived from that of limb, 539,
549, 588

etho-Measurements: in watches, 236; micro-
scopical, 241

Limitations of the steam engine, 2, 237

Meat, tough, 431, 453, 475, 545

Mortar: analysis of, 450; black, 281
Motay's, du, last invention, 50
Motion: heat and, 157, 163, 192, 217; of
trains, 257, 301, 353; wanted, 517
Motive power for amateurs, 3, 126, 2R,
292, 414, 532
Motor: Ericsson's domestic, 129; for
small boats, 374, 403, 476, 501, 545, 570,
593, 617; improved electro, 29; new
electric, 887, 421; Trouvé's electric, 415,
479, 502; water, 220
Motors: domestic, 25; electric, 527; small,
193

Oxygen: effects of inhaling, 74; making, Poets, Venus and the, 569

Poisonous nature in arsenic, chemical
cause of, 124

Polaris, comes to, 13, 85, 147, 158, 278, 284
Polariscope: 122, 194; detection of sugar,
355; how to use in examining liquid
substances, 367

Pole, the South, 44, 94, 215
Polishing card-case, 311; French, 45, 72,
175, 227, 406; mahogany, 73; pallets,
168; pebbles, 241; slate, 454, 476, 501;
syenite, 286; watch-wheels, 46; wood-
work, 382, 406

Popular scientific lectures, 460
Popularisation of science in Paris, 228
Portable: engine cylinders, 284; music
stand, 168

Portland cement, testing, 169
Portrait lens, 359, 381

Potash, pure, by alcohol, 624
Potatoes from seed, 19, 42, 93, 117, 143
Potential energy of yeast, 540
Pottery decoration, 484
Powder: meal, 406, 428; silvering, 284
Powell and Lealand's: condensers, Web-
ster's and, 323; new 1-12th oil immer-
sion, 84; new homog. immersion 1-12th,
183;-extra front lenses to, 233
Power: brake, 571; circular saw, 597,
619; for a 2in. telescope, highest, 59, 73;
horse and man, 599, 621; lighting. 478;
nominal, 619; of boiler, 597; of water-
wheel, 501; small circular saw, 620;
transmission of, to a distance, 531
Powers: neglected, 567; of reflectors used
terrestrially, 277, 373
Prazmowski, of Paris, 612

Pendulum: 588, 597; clock, 624; regu- Pre-glacial effects in north-west of Eng-

Propeller 19; pitch of, 144
Properties of glass, 353, 378
Property: land, 20; married women's,
405

Providence of bees, 180

Prussian blue, chemical erasure of, 599
Public rights, railways and, 427
Pulley on shaft, keying, 617
Pulleys, 454

Pumice, composition, 527
Pump: 220; air, 18, 117, 121, 191, 243, 263,
283, 311, 408, 428, 501; centrifugal, 308;
hand, 357; petroleum, 622: pipes, prov-
ing, 569; special, 383; Sprengel, 539;
valves, 479

Pumping: 74; by steam, 244, 263; engine,
620

Pumps, 242, 307, 503
Punch, weak, and a weakly daily, 444
Punching, 324, 374
Purity of water, 335, 357, 377
Pyramidal nitre crystals, 97, 120, 329
Pyrochemical apparatus, ten guineas prize
for the best, 378
Pyrogallol, preparing, 417

Pyrological notes, 52, 127, 271, 293, 423,

Solids and fluids, 162; making a liquid,
two, 91

Sound: producing, by light, 49; signalling
by, 363; transmission of, 265, 285; velo-
city of, in gases, 129
Soundboards: "Fiddler" on, 85, 304;
piano, 27, 128, 293, 437
Sounding a metal plate, 167
South: north and, 478, 546, 570, 588; Pole,
the. 44, 94, 142, 215
South-Eastern engines, 594
Southing of fixed stars, 298
Spain, breadmaking in, 89
Speaking condenser, 465
Special pump, 383

Specific gravity, 406, 470, 545
Specification: for composite screw yacht,
599; for steel screw yacht, 150, 165, 212,
259; of patents, 352
Specimens, botanical, 168
Spectacle frames, rusty, 454
Spectra of colour-blind persons, 509; of
metalloids, 32; ultra-violet, report on,

Spectroscope: 216, 264, 307; difficulty, 149
Spectrum: analysis as applied to the solar

system, 584; colours of the, 380; ocular,
281, 596, 515; on screen, 97, 191
Speculum: dewing of flat and, 398; metal,
122; working, 21
Speed: American views on high, 180;
indicators, 570; of light, 333; of model
locomotive, 220; of trains, 38, 541, 591
Speeds: high, and the mechanical theory
of heat, 50%; lathe, 622; of engines, 594
"Sperans," to, 216, 217, 218, 220, 243, 265,
253, 331, 404, 427, 428, 594
Spherical surface, refraction at a, 616
Spiral diaphragm, Mayall's, 558
Spirit flames, coloured, 243
Spirits: 121: proof, 427

Split dies, tapping, 264, 284, 307
Spot: Barnard's, 421, 446, 465; transits of
the red, 258, 276, 398; white, on Jupiter,
277, 302, 324, 350, 421, 422
Spots: on Jupiter, dark, 158, 210, 234, 258,
303, 468;-new, 11, 181; on Plato, 85,
110, 299; solar, 12; white on Jupiter,
468

Spotted telescope glass, 311
Sprained ankle, 18
Sprengel pump, 5-9
Spring: balance, 166, 239; plate, how to
weld a broken, 116; tides. 145, 157
Springs: gold and silver, 21, 95; piano,
120; winding, 19

Square: measure, tables for, 333; root,
rules for, new, 64, 91, 115
Stage, Watson's new mechanical and
rotating, 605

Stromeyer's strain indicator, 177
Stroudley's regulator for the Westing-
house brake, 118

Students' microscopes and "cheap" opti
cal work, 323

Study of botany, 490; of the constella-
tions, 464

Substage: oblique illumination by swing-
ing, 183; Swift's new double sector,
183; swinging, 582
Suction box for paper machine, 284, 307
Sugar, polariscope detection of, 355
Sugg's improvements in gas burners, 27
Sulphur fumes, 501, 522

Sulphuretted hydrogen, testing, 623
Sulphuric acid, manufacture of anhydrous,
53

Sun: altitude of, 256, 265, 298; distance
of a planet determined by its transit
over, 298; distance of earth from, 502;
magnesium in the, 296; photography,
94; size, &c., of, as seen from Mercury
and Venus, 348, 382
Sundries, 237

Sunglass, dark, 256
Sunrise at New York, 157, 281
Sunspots: 109, 122, 348; and terrestrial
maguetism, 348; Symons and, 444
Surgeons, navy, 574

Surgery and superstition in Neolithic
times, 4
Surrey Canal Junction accident, 565
Survey, geological, 70
Surveying, practical land, 598
Sussex, Roman ironworks in, 426
Swan's electric lamp, 3, 234
Swarming, bee, extraordinary, 255
Sweating of glass, 221
Swift's: comet, 278; new double sector
substage, 183

Swinging substage, 582
Swords, cleaning old, 119
Syenite, polishing, 286

Sykes' signal-locking system, 188
Symons and sunspots, 414
Sympiesometer : how to construct a cheap
and simple, 38; refilling, 356
Synthesis: of citric acid, 204; of indigo,

Stars: dimensions of. 109; double, 12;-
addendum to Handbook of, 296, 446;
drawing groups of, 59; near Beta Cygni,
faint, 234, 277; occultation of, 157, 192;
southing of fixed, 298
States, tea-raising in the, 425
Steam: carriage, engine for light, 408;
consumption of, 501; crab, 405; cylin-
ders, removing grease from, 526; eco-
nomy of working expansively, 621;
expansion of, 464; for Rob Roy, 220,
212; heat of, 526; heating by, 206;
launch, 221. 310, 329; pressure and
volume of, 72; pumping by, 44, 263;
reversing gear on Glasgow and South-
western railway, 352; tricycle, 146, 163,
191, 194, 335, 383; yacht of steel, speci-
fication for a screw, 150, 165, 212, 259
Steamboat, model, 213, 281, 307
Steam-engine: 306, 453; dimensions, 307;
lunitations of the, 2, 237; most econo-
mical cut off in. 90; rules, 242, 306;
simple single-acting, 393; the history of

the, 507
Steel: a great crucible casting, 550; ball,
turning, 244, 264; cast, welding, 337,
465; coating, with glass, 251; composi-
tion and properties of, 536; hard sol-
dering, 256, 355; making in Cleveland,

313;-Sir H. Bessemer on, 321; ropes,
strength of, 452; saws, hardening, 167;
screw yacht, specification for a, 150, 165,
212, 259; softening, 244, 264; tools,
hardening, 547, 548

Teeth, artificial, 425, 567, 592
Telectroscope, the, 534
Telegraph: electric, 17; line, 97, 120;

machine, new, 154
Telegraphs, Australian, 383
Telephone: 478. 502; Bell's, 147, 191.217
Gower-Bell, 476, 522; Herz, 584; Ken-
nedy's, 160, 284; making, 382; new
Gower, 509
Telephones, 455
Telescope: 283, 407, 428; Cassegrain
reflecting, 614; construction of, 193
310; dialyte, 382; draws, 74; eyepicces,
9, 44, 109; glass, spotted, 333; Gregorian,
451: highest power of, 46, 59, 73, 94;
house, 209; lens for, 572, 595; mounting.
352; object-glass, 549; small, moueting,
131, 157; spotted glass in. 311; stand,
19, 42, 59; 3in. astro., adapting, 143
Telescopes, contracting the apertures of
large, 60
Telescopic: eyepieces, 60; matters, 299
Temperature: and rainfall in London, 5;
digestion and, 125; pressure, and volume
of gases, 333; sunspots and, 345
Temperatures: best regulator for high.
Tenant; absconded, 190, 191; trustees and,