546 
DR. A. SCOTT ON THE COMPOSITION OF WATER BY VOLUME. 
A, Rulb for measuring volume of gas. 
R, Graduated tube calibrated for measuring residual volumes. 
C, Manometer tube. 
D, Narrow tube with mark. 
EE, Barometer. 
F, Standard metre scale divided into millimetres. 
G, Thermometer graduated in C. 
H, Jar for mixing gases before explosion. 
I, Wooden block to support mercury trough. 
J, Tube for exploding gases under diminished pressure. 
K, Mercury trough of wood, varnished. 
L, Water tank, for maintaining temperature steady, with stirrer aird levelling screws (con¬ 
tents = about 14 litres). 
M|, Mo, Mercury reservoirs. 
No, Nji, Small mercury reservoirs for driving gases out of tubes into A and B. 
O, Tube, with silver oxide. 
P, Tube, with palladium. 
R, S, Geissler’s bulbs, with pure water. 
T, Geissler’s bulbs with pure sodium hydrate (from sodium and water). 
U, Tube for hydrogen to pass in at from generating vessel, but sealed up when palladium hydride 
is used. 
Vo, Vn, Gauges and safety valves tvith mercury covered with water for oxygen and hydrogen. 
1, 2, 3, 4, 5, G, 7, 8, and 0, safety taps with syrupy phosphoric acid. 
