45, CORNHILI., E.G., AND 122, REGENT STREET, W., LONDON. 



435 



FIG. 2567. 



FIG. 2572. 



FIG. 2567*. 



Each. 

 s. d. 



2557 Glass Globe, with Stopcock, brass caps, sliding forceps 



and balls, for showing Electrical Light in vacua, and 

 decomposing gases by the ignition of Carbon points 

 with the galvanic battery (fig. 2557, see also fig. 2451) . 



2558 Lamp, Electric, with self -regulating apparatus for the 



carbon points 



2559 Ditto ditto Duboscq's arrangement . 



2560 Decomposition Apparatus, with Single Tube, for 



collecting the gases combined . . .7s. 6d. 15 



2561 Decomposition Apparatus, with single Graduated Tube 



(fig. 2564) 



2562 Apparatus for Decomposing Water (Volta-meter), with 



double tubes for collecting the Oxygen and Hydrogen 



gases separate, small size . . . . . . 10 6 



2563 Decomposition Apparatus, Double Tubes, larger, 



suitable for lecture tables (figs. 2563 and 2563*) from 110 



2564 Decomposition Apparatus, with Double Tubes 



graduated into lOths and lOOths of a cubic inch . 1 10 



2565 Volta-Meter, with large Platinum Electrodes, divided by 



a porous diaphragm, for experiments with large and 

 very powerful batteries (fig. 2565) .... 



2566 Faraday's Apparatus, for Electrical Chemical Decompo- 



sitions, consisting of glass trough divided by a 

 diaphragm (figs. 2566, 2566*) 14 6 



2567 V and U Tubes for the decomposition of Neutral Salts 



(figs. 2567, 2567) 050 



2568 Pieces of Platinum and Silver Wire soldered together 



alternately ; a strong voltaic current passed through 

 causes the platinum to become red hot without 

 heating the silver 



2569 Apparatus to exhibit the increase of temperature 



produced by the passage of an electric current through 

 a fine platinum wire enclosed in a glass tube, which 

 prevents radiation, and a much greater length of wire 

 is heated than if it be exposed without the tube 



2570 Electro-Thermometer (Harris's) for measuring the 



Calorific effects of electricity ..... 



2571 Aurora Tube for experiments with the tube exhausted of 



air, or charged with different gases (fig. 2571) . 



Each. 

 s. d. 



330 



12 12 



13 



110 

 150 



16 



1 10 



220 



330 



110 

 10 6 



12 6 



300 

 1 18 

 330 



