366 



EQuilibrium of Gases. 



No. 52707 



52707. 1:12. 



52709. 1:10. 



52 710. 1 : 7. 



52.707. Apparatus for Experiments with Gases, after Schneider, Figure, suitable for a 

 large number of experiments on the theory of the equilibrium of gases and on the theory 

 of heat; can also be used as a Gas Measuring Apparatus; suitable for school use . . 



The apparatus consists of 2 separate stands provided with weights, with 3 burette tubes 

 each having two stopcocks and graduation; 1 rule with 2-coloured centimetre graduation on one side 

 and millimetre graduation on the other; 1 round flask with rubber stopper and angle tube. 



The apparatus is intended for demonstration work in teaching and for students' exercises. It 

 is suitable for the following demonstration experiments, among others: Demonstrating the Syphon 

 Barometer (also with variable vacuum); the Testing of Barometers; the Mercury Air Pump; for pro- 

 ducing a Vacuum Tube with the Torricellian vacuum; demonstrating boiling and re-boiling on cooling 

 in vacuo; demonstrating the MacLeod Vacuum Gauge; for experiments on the Vapour Pressure of 

 Ether in vacuo and in air; for the suction, conduction and measurement of quantities of gas; de- 

 monstrating the Pressure Gauge; Gay-Lussac's Law on the Expansion of Gases at constant pressure; 

 on the increase of Pressure of Gases when heating in constant volumes; on the variation in Volume of 

 Gases with variation of pressure and temperature; Solubility of Gases in liquids ; measuring the Vapour 

 Pressure of water, etc. etc. 



52.708. - - idem, with iron stand 



52.709. Pressure Flask, after Schneider, Figure, for measuring the Pressure in Water Leads, 

 the Air Pressure produced by the water lead; for demonstrating Heron's Ball and the 

 Air Chamber 



52.710. Diving Bell, Figure, of glass, with light-holder, suspended in stand, for showing 

 that air occupies a space 



52.711. -- idem, with rubber bellows 



52.712. Indiarubber Balloon in wood box, Figure, with loosely fitting lid and 6 iron weight- 

 ing plates, for showing the elasticity of air 



If the lid, and consequently the balloon, is weighted with the iron plates, this depresses the 

 balloon more or less. 



.")!'. 7 1:{. Apparatus for showing the Elasticity of Air, Figs. A and B 



A piston fitted with a handle and hook, moves in vacuo in a metal tube, Fig. A, provided witli 

 a bottom piece and a hook; the tube communicates with the outer atmosphere by a stopcock. If tin- 

 cock is closed and the piston pushed in, the piston tends to spring back when an attempt is made 

 to pull it out. A tripod and ;i loading plate are supplied with the apparatus; the tripod being dctaelialile 

 (Fig. B), in order to show also the Compressibility and Elasticity of the compressed air. 



Double Sphere for showing the Expansion of Gases: see Nos. 51,751 and 51,752, p. 250. 

 Glass Sphere for weighing Air: see Auxiliary Apparatus for tin- Air Pump. 



s. d. 

 3. 12. 



4. 10. 



0. 18. 



1. r>. o 



1. 1'2. 

 0. 0. 



1. 0. 



Cl. 5433,5422, 841. 



