case,

Abacus, Pythagorean, curious property of, 36
Acid, sulphuric, consumpticn of, 64

Gamble's, patent improve-
ments in manufacture of, 79
Air cburn, 320
Alleghany suspension bridge, 272
Allen's patent priming preventer, 104
Allison's safety boxes for railroad carriage

axles, 29
Alloys, voltaic reduction of, 11

Park's patent improvements in the
manufacture of, 58
Alphabet for deaf and dumb, ancient, 45
Amalgamation of metals, Weiger's patent

improvements, 78
Amazon, the, steam navigation of, 432
America, cotton spinning in, 112
American locomotive, 112
Antediluvian relic, 56
Architecture, naval, Millar's experiments in,

131
Armstrong's colossal hydro-electric machine,
64

motive power, 402
Arnott stove adapted to workshops, 103
Asbestos, artificial, specimen of, 445
Atmospheric propulsion, 85, 170

pressure, clocks rendered regis-
ters of, 86

railway system, 107, 137, 147,
177, 193, 208, 209, 226, 248, 256, 287,
305, 347, 358, 364, 380, 406, 427

railways, Prosser and Carcano's
improvements in, 105

Nasmyth and May's, 136

railway engine, mode of check-
ing, 170
Atomic vagary, 144
Aurora borealis, phenomena connected with,

429
Axles, railway carriage, Allison's safety

boxes for, 29

Barometrical pressure, 9, 315

at the Antarctic circle,
35
Barrel cleaning and drying process, Davi-

son and Symington's, 32
Barton's improvements in fire engines, 28
Bath, vapour, ancient, 46
Beams, cast and wrought iron, in buildings,

use of, 220
Beaumont's anti-friction valve, 88
Bell, diving, Payerne's, 352
Beningtield's electric gun, 16, 96
Bentbam's, Sir Samuel, steam dredging ma-

chine, 113
Bertrand v. Christofle and Co., patent law

13
Beverley's patent buckles for connecting

scraps, 395
Biram, B., Esq.; patent improvements in
oscillating engines, 1; Steam vessel log,

216
Blubber, Kilburn's machine for mincing,

208
Bodies, law of falling, 334, 371
Boilers, Dr. Ritterbandt's method of pre-
venting incrustation in, 15, 21, 336

Johnston's patent sheet water space,
21, 65
Boiler furnace, Coupland's patent, for the
prevention of smoke and saving of fuel, 24

ancient wooden, 46
Books, Laighton's patent machine for back-

ing, 394
Boring the earth, ancient method of, 46
Boswell and Ricket’s registered fire.kindler

and smoke-elevator, 17
Bradley's patent improvements in smelting,

316
Bread, ancient kind of, 47
_, flour, and potatoes, 271
Brewing, on, by Henry Dircks, Esq., 437
Bridge, Weston-super. Mare suspension, 80

fall of the Ballee Kuall suspension,
192

tubular suspension, 248

Alleghany suspension, 272
Bridges, wooden, 45

suspension, 352
British Association, Cambridge meeting, 9,

73
Brown's patent improvements in combining

cast-steel with iron in the construction of

carriage springs, 58
Brown, Sir Samuel, on the destruction of

Baddeley, Mr. W.; Report on London fires

vindicated, 339; on friction of water
through hose, 366 ; on reciprocating and
crank-worked engines, 386; on the in.
vention of the portable cistern, 409; on

Walker's hydraulic elevator, 436
Baillie's transparent slide valve ventilator, 8
Balloons, Muzio's patent for directing the

course of, 207
Bain's electro-magnetic discoveries, 411
Baird's sweeping paddle, 96

ores, 57

Clocks, manufacture of, in America, 320
Coal, ancient proposition for using refuse,
46

Ransome's patent for combining small,
415

fields in China, Taylor on the, 265

mines, employment of electric light in,
131

Milligan's proposition for pre.
vention of accidents in, 244, 333
Columns, stone, strength of, 73
Compass, mariners’, ancient, 27,
Conic sections, 217
Convex surfaces, geometrical conversion of,

82, 97, 120
Copper ores, electro-chemical treatment of,
155

plates of superior fineness, Von Ko-
bell's mode of obtaining, by electric pre-

cipitation, 311
Copyright of designs, 222
Cotton spinning in America, 112

press, Prescott's patent improve-
ments in the, 285
Coupland's patent boiler furnace, for the

prevention of smoke and saving of fuel, 24
Croll, on the construction and use of gas

meters, 358
Cubic equations, 86, 200
Curve-lined solids, 72
Cylindrical ring, properties of the, 143

sections, 217

the wooden piles of the Brighton Pier by

the teredo navalis, 90
Brown's patent machine for making bricks

from untempered clay, 191
Brunton's patent improvements in dressing
Buckle for connecting straps, Frashure's
patent, 395

Beverley's
patent, 395
Buffing apparatus, Rayner's patent, 242
Bunsen, Prof., on furnace gases, 11
Burt's governor for regulating the move-

ments of mill-wheels, steam-engines, &c.,

29
Butter, mode of sweetening, 349
Cambridge meeting of the British Associa.

tion, 9, 73
Camera-obscura, ancient, 45
Canada, manufactures in, 144
Canal steam navigation, 80
Candles, how to increase the light of, 45

and lamps, ancient substitute for,
45

Power's patent improvements in the
manufacture of, 57

Wilson and Co.'s patent improve-
ments in the manufacture of, 59
Carcel meteor lamp, 401
Carpets, East India, 63
Carr's patent improvements in fish nets, 30
Carriage springs, Brown's patent improve-

ments in, 58
Carson's patent for producing steam vacuum,

428
Cask gauging, 245
Cayley, Sir George, Bart. ; train buffer car.

riage, 145
Cement for broken glass, 45
Centrifugal force, Hurd's patent for sepa.

rating liquids from sugar, &c., by, 191
Centrobaric mensuration, 19, 132
Chafing-dish, ancient, 28
Champion's improvements in burning ani-

mal charcoal, 414
Chauvier's improvements in the manufacture

of soap, 414
Chemical works, Dr. Turner's method of

purifying the vapours of, 12
China, coal-fields in, 265
Chinese flax, 64
Christofle and Co. v. Bertrand, 13
Churn, air, 320
Circle, the rectification of, 386
Circles, the periphery of, 426
Cistern, portable, the invention of the, 409
Clanny's safety-lamps, 96
Claviole, the, on the history and resuscita.

tion, by J. I. Hawkins, Esq., C.E., 122
Clay, untempered, Brown's patent machine

for making bricks from, 191
Clocks, railway station, 70

rendered registers of atmospheric
pressure, 86

1

Daguerreotype process, lenses proper for
the, 35

pictures, mode of colouring,
94
Day and night, 272
Deaf and dumb, lineal alphabet for, 45
De la Haye's submarine railway, 161, 248,

325
Delineator, Storer's, 93
Designs, copyright of, 222
Diagonal skinning, 320
Dircks, Henry, Esq., on brewing, 437
Distances, method of computing direct, 4,
Int 135, 149, 234
Door fastening, noiseless, 425

latches, Hoggan's patent improve-
ments in, 285
Drainage, principles and practice of, 299,

309, 396
Dredging machine, steam, Sir Samuel Ben-

tham’s, 113
Dutch oven, ancient, 28

Furnaces, Bradley's patent improvements in

smelting, 316
Furnace, Quillard's patent, 317

Electricity, magnetism, and light, 318, 393
Electro-chemical treatment of copper ores,
155, 189

culture, 164, 318

magnetic discoveries of Mr. Bain,
411

magnetism, application of, ito rail.
way propulsion, 426
Electro-telegraphy; telegraph across the At-
lantic, 32

Prof. Morse's electric
telegraph, 250
Electrotype, improvements in, 84
Elliot's patent improvements in stoves and

furnaces, 208
Embankment, ancient mode of, 47
Engineering, railway, case in, 111, 179
English's patent improvements in distilling

turpentine and tar, 60
Engravings, shrinking of paper in impres-

sions of, 96
Eolipile, thé, 45 ;
Equations, cubic, 86, 2009

new method of finding the roots
of the higher, 331.1* 0,961,
Ericsson's screw propeller, 204, 239
Etzler's iron slave, 2561-13
Experimental squadron, 47

steam fleet, 429

Gamble's patent improvements in the manu-

facture of sulphuric acid, 79
Gas-meters, Croll, on the use and construc-

tion of, 358
Gases, furnace, Prof. Bunsen and Dr. Lyon

Playfair, on, 11
Gelatine, Roper's patent improvements in

the manufacture of, 415
Geological curiosity, 320
Geometrical problems; extraction of the

square root, 65; conversion of convex
surfaces, 82, 97, 120 ; rectification of

the circle, 386
Geometry, mechanical, 190
Glass duty, repeal of the, 9

malleable, re-discovered, 63

new process for silvering, 190
pipes, Roe's patent improvements in,
321
Goodwin Sands, lighthouse on, 96
Gordon's patent fumific impeller, 273
Governor for regulating the movement of

mill-wheels and steam-engines, Burt's

patent, 29
Gradients, railway, 76
Grates, a yarn upon, 233
“ Great Britain," 151, 170, 182, 256
Gum Senegal, Fouquet's patent substitute

for, 414
Gun, electric, Beningfield's, 16, 96
Gunpowder, how to dry, by hot water, 45

“Faetorial Analysis,”! Tate's Treatise on, 165
Fallacies, mechanical, 134
Falling bodies, law of, 334, 371
Faraday, on the action of sea-water on iron,

89, 318
and on electricity, magnetism, and

light, 318, 332, 392
Filter, Truman's patent, 97, 348,
Fire-brigade, London, and Mr. Baddeley's

reports, 42, 53, 76, 339, 366, 386, 409,
411

damp, on the composition of, 333
engines, Barton's improvements in, 28

new, 320
kindler and smoke elevator, Boswell
and Ricket's registered, 17,
Flax spinning, Russell and Peter's patent
improvements in, 33

Chinese, 64
Fouquet's patent substitute for gum Senegal,

414
Frashure's patent buckle for connecting

straps, 395
Freezing of water in red-hot vessels, 12
French patent law case, 13
Friction-valve, anti, Beaumont's, 88
Frost's improvements in the steam-engine,

29
Fuel, artificial, Ransome's, 415
Furnace gases, Prof. Bunsen and Dr. Lyon
Playfair, on, 11

boiler, for the prevention of smoke
and saving of fuel, Coupland's patent, 24
Furnaces and stoves, Elliot's patent improve.

ments in, 208

Haerlem Lake, drainage of, 224
Hammer, Nasmyth's steam, 72, 75

vertical forge, Seller's, 394
Hawkins, J. I., Esq., on the history and

resuscitation of the claviole, 122
Hayle engine-works, 144
Herschel's, Sir John, address to the Cam-
bridge meeting of the British Association,

1845, 9
Hill's patent for lubricating machinery, 395
Hinges, Wilke's patent improvements in the

manufacture of, 415
Hoggan's patent improvements in door.

latches, 285
Hosiery manufacture, the, statistics of, 378
Howell's reading easel, 225
Hurd's patent for separating liquids, by cen-

trifugal force, from sugar, 191
Hunt, Mr. R., on the chemical changes pro-

duced by solar rays, 215
Hydraulic elevator, Walker's, 436
Hydro-electric machine, Armstrong's colos.

sal, 64

2

Ice formed in red-hot vessels, 88
Iceland transformed into Sunland, 112
Incrustations in boilers, Dr. Ritterbandt's

method of preventing, 15, 21, 336