Figure 1 is a side elevation
Figure 2 is a vertical section on the line x of Figure 3
Figure 3 is a horizontal section on the line y of figure 2 and 4

• shows wire-gauze diaphragms (called "interceptors") e

Figure 4 is a vertical section on the line z of figure 2 and 3

• shows exhaust-valve M and valve h
  

A is the cylinder
B piston
C barrel of the air pump
D piston
E rod (common to piston B and D)
F a chamber/reservoir with two inlets (c and d)
G reservoir
H recess or chamber (formed by the bottom of cylinder B)
I screw valve
J revolving-cam
K lever
L exhaust-port
M (Fig. 1) balance-wheel
M (Fig. 3) exhaust-valve
X line
Y line
Z line

a induction valve
b eduction-valve
c atmospheric air inlet to chamber F
d illuminating gas inlet to chamber F
e wire-gauze diaphragms (called "interceptors")
f conducting-passage
h valve
k valve-rod
j spring
m V-shaped channel