PLATE II. 
Apparatus for Gas-Analysis. 
I. — Side view of pneumatic trough for gas-burette and exploder. 
In. — Ground plan of same; r, the two wells for the U -tubes of the burette and 
exploder. 
I I. — F, graduated tube ; f, narrow side tube communicating therewith ; M, mer- 
cury reservoir, communicating with F through india-rubber tube m; 0, inlet, 
P, outlet tube for water of the bath. 
I In. — Ground plan of same; H, water-bath; N, outlet pipe, other letters as in 
first figure. 
III. — D, explosion tube, communicating by india-rubber tube b with mercury 
reservoir a ; c, capillary U-tube, filled with mercury, to connect terminal of 
induction coil with one of the platinum wires. 
IV. — P neumatic trough belonging to the gas-pipette; side view. 
IVa. — Ground plan of same. 
V. — Gas-pi) »ette. T, glass ball containing mercury and liquid reagent, connected by 
india-rubber tube t with mercury reservoir V ; R, lateral supplementary 
mercury reservoir to enable one to sweep gas from capillary U-tube into the 
tube standing in B. 
VI. — Improved form of gas-pipette devised by Mr. Lennox. A corresponds to T and 
R in fig V.; b serves to connect mercury-reservoir (V, fig. V.) with pipette A 
projKir. 
