The Gas Connections and Governor.
For one machine use a ½-inch supply pipe, and increase about ¼-inch for each additional machine, a 2-inch pipe being sufficient for a plant of twelve machines. A ½-inch feed pipe should be run to each machine.
A gas governor is furnished by the Linotype Company, as shown in Fig. 10, which should be attached to the main pipe near the machines. This governor, together with the one on the machine, will keep the gas at a uniform pressure. The governor (Fig. 10) works as follows:
When the gas pressure becomes too heavy it raises the float B, which sets in mercury at point J and A, and closes the valve C, points 1 and 2.
A small bottle of mercury is sent with each governor; also two small lead weights, which go on top of float B. The arrows show how the gas enters and leaves the governor.
Fig. 10.