[Larger plate.]

Section 41.—GOVERNING AND REGULATING SPEED, &c.

(See also [p. 96].)

[2200]. Atmospheric governor. Rod A is connected to reciprocate with the engine, B is connected to the equilibrium throttle valve, C is an inlet valve for air, and D an adjustable outlet valve by which the speed is regulated. For continuous instead of intermittent action on the rod and piston B, the air pump A should force air into an intermediate chamber above the piston B by addition of a diaphragm and delivery valve.

[2201]. Gas engine pendulum governor. Hit and miss. The rocking trip C falls out of gear by its own weight when the pendulum moves so fast as to release it. The upper ball is used to adjust the motion of the pendulum to the speed required.

Crank-shaft governors. See [Section 79].

Self-regulating dampers are applied to boiler flues, and are operated by the pressure of steam, so as to regulate the draught.

Governing the speed of hoists. See [No. 1495].

[2202]. Gas engine governor. The revolving cam throws the vertical arm of the lever far enough to close the gas valve when the speed increases beyond the normal.