The reservoir of each car, containing a certain supply of gas,
communicates with a regulator, b, the importance of which we scarcely
need point out. This apparatus consists: (1) of a cast-iron cup, A,
closed at the top by a membrane, B, which is impervious to gas; (2) of a
rod, C, connected at one end with the membrane, and at the other with
a lever, D; (3) of a regulating valve resting on the lever, and of a
spring, E, which renders the internal mechanism independent of the
motions of the car. The lever, acting for the opening and closing of the
valve, serves to admit gas into the regulator through the aperture, F.
This latter is so calculated as to allow the passage of a quantity of
gas corresponding to a pressure of 16 millimeters. As soon as such a
pressure is reached in the regulator, the membrane rises and acts on the
lever, and the latter closes the valve. When the pressure diminishes,
as a consequence of the consumption of gas, the spring, E, carries the
lever to its initial position and another admission of gas takes place.
Communication between the regulator and the lamps is effected by means
of a pipe, z, of 7 millimeters diameter (provided with a cock, d, which
permits of extinguishing all the lamps at once, and by special branches
for each lamp.
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