690 Transactions of the American Institute. 



extending through the end of the steam chest, where it receives 

 motion from a crank, m, which is adjusted in its position by the 

 governor. The exhaust ports of the cylinder, I, are made upon 

 the bottom, and are at a little distance from the end, while the 

 steam ports are upon the side and at the extreme end of the cylin- 

 der. By this arrangement the piston closes its own exhaust port 

 and cushions on the remaining distance, thus dispensing with all 

 dash-pots or air cushions, and causing the valve to work without 

 any noise. 



The valve, i, being balanced, and the rod, L, carried through its 

 stuffing box by the main valve, there is the least possible power 

 required by the regulator to adjust the crank, m, thereby insuring 

 a more sensitive action than can be attained where the governor has 

 labor to perform. 



The governor is peculiar, and is shown at Fig. 3. The balls, N, 

 are hung upon arms in the usual manner, which arms are jointed 

 at their upper ends to a head attached to the rod, o, which slides 

 within the hollow shaft that drives the balls; the motion being 

 communicated through the radius rods, p, which are jointed at 

 their lower ends to the shaft, and at their upper ends to the center 

 of the arms, n. The rods, p, are half the length of the arms, n, 

 measuring from the center of the ball, and it will be readily seen 

 that in consequence of this arrangement the arms, n, and rods, p, 

 form a parallel motion, and compel the balls to move outward in a 

 horizontal plane. 



In the ordinary pendulum governor, the balls move in the arc 

 of a circle, and rise as they extend; it therefore requires an 

 increased speed to maintain them in their advanced position, and 

 the engine must consequently run faster when the load is light 

 than when it is heavy. In this improved governor it will be seen 

 that the gravity of the balls has no tendency to move them in 

 either direction, as they are compelled by their attachments to 

 move in a horizontal plane. The centrifugal force causes them to 

 diverge, and a weight, W, tends to bring them towards the shaft. 

 When, therefore, these two forces are in equilibrium, the balls will 

 remain in the same position, but as either preponderates, they are 

 moved in a corresponding manner, thus aflecting the speed of 



igine by varying the amount of cut-off. The weight, W, is 

 Bupportcd upon a bent lever, which is so proportioned that the 

 centrifugal force of the balls, at any given speed, will just balance 

 the weight, W, in all positions. The speed of the engine will, 



