Small Single-barrel Air Pump, with Receiver, fig. 81, Large-size Double-barrelled Pump, fig. 83 .. { .. 3 10 4 14 6 7 7 8 8 9 9 12 12 ..19 Leslie's Ice Pump, with three receiver-plates, fig. 104 ..60 accurate exhaustion Ditto, without Smeaton's ...60 200 00 Flat Brass Plate ground for open Receivers, with collar Syringe and Lead Weight, with ground brass plate for Fountain in Vacuo, best make, fig. 90. Ditto ditto, common .. Tall Fountain Glasses Wheel and Upright Barometers (see page 20.)... Open and close Receivers for Air Pumps.. Bladder Glass for ditto Hand Glass ..... 0900000000 Bell Experiment, illustrating that Air is essential to Sound 0 10 0 Ditto ditto, best make, fig. 91 .. 1 0 0 Bacchus Experiment, for showing the Elasticity of the At- Windmills, on a new and superior construction Torricellian Experiment, for illustrating the pressure of the Atmosphere Fountain and Jet, which act by condensed air, consisting of a Condensing Syringe, stout brass Vessel and Jets, packed in a case, fig. 94 . . . . . . 3. 3s. and 5 5 0 Model of Water Pump, showing the principle and absurdity of the term suction Ditto of Forcing Pump, on mahogany stand, fig. 96.. 2 15 0Models of the two, mounted on a mahogany stand, with Breaking Squares, to illustrate the pressure, likewise the Wire Cage for ditto Filtering Cup, with ground brass plate, for showing the porosity of wood, fig. 97 Fruit Stand, for supporting shrivelled fruit, under receiver of Air Pump Lung's Glass, for illustrating the elasticity of air, fig. 98, 0 6 0 Bladder Frame and Lead Weights, for illustrating the elasticity of Air, fig. 99........ Hemispheres, for illustrating the pressure of the Atmosphere, small.. Second size Third size.... fig. 100 Apparatus for Freezing Water by evaporation, under an Foul Air Pipe, consisting of ground brass plate for open Exhausting Syringes Condensing ditto... Ditto ditto, both in one instrument Single Transferer, fig. 101. Double ditto, fig. 102 Guinea and Feather Apparatus, 3 falls. ... .... 0 7 6 0 15 0 0 18 0 1 10 0 .... 10s. 6d. and 0 12 0 Ditto ditto, 2 falls, fig. 103 Glass for ditto Set of Pneumatic Apparatus, packed in case, consisting of sloping barrel Air Pump, open and close glass Receivers, Fountain Apparatus, pair of Hemispheres, Sliding Wire and Collar, Syringe and Lead Weight, Bladder Frame and Weight, Filter Cup and Glass for Mercury, Hand Glass and Fruit-stand Apparatus consisting of a Brass Stand and Balance Beam, with a piece of cork suspended at one end and a brass weight at the other, illustrating that two bodies which are exactly balanced in an Atmosphere of common density, are not when in a vacuum ...... 6 6 0 08 0 Palmer's Improved Cylinder Electrical Machines, with double cushions, fig. 106.. £5. 5s., £10. 10s., and 18 18 0 By the construction of these Machines a great increase is obtained in the quantity of Electricity, and the Instrument rendered far more compact and elegant. Larger Cylindrical Electrical Machines of either kind made to order. PLATE ELECTRICAL MACHINES. 9-inch Plate Machine... 330 12-inch Plate Machine with Electrometer attached to stand for regulating the intensity of the shock when used for medical purposes, fig. 107, £4.10s. 18-inch ditto ditto, £7. 10s. 24-inch ditto ditto, £12. Fig. 107. Glass Plates for Electrical Machines, 9 inches diameter, Conductors for Electrical Machines, black japan, 3s. 6d. 5s., 9s. and upwards Ditto ditto brass, from 7s. upwards. Glass Jars for Coating, -pints 1s.; pints 1s. 6d. ; quarts 2s.; 3-pints 3s. each Brass Balls, 6d., 9d., 1s., 1s. 6d, 2s. each, and upwards Fig. 108. 2 10 0 4 4 0 Cannon Electrophorus in mahogany stand, mounted with an electrical cannon for firing mixtures of Hydrogen and Atmospheric Air. £2. 10. Fig. 109. Double 18-inch Plate Electrical Machine, a very splendid and powerful instrument, on Woodward's principle, fig. 109 .... 14 14 0 The whole of the above Electrical Machines may be had packed in deal or mahogany cases, with Medical or other Apparatus... Fig. 110. Harris's Unit Jar Electrometer, £1. 15s. Fig. 111. Coulomb's Torsion Electrometer, £2. 10s. Fig. 112. Harris's Balance Beam Electrometer, £4.4s. |