A. Cushion is the compression of steam let in through the lead of the valve in the clearance of the cylinder, and is for the purpose of catching the weight of the piston and rod, cross-head and connecting rod when the engine reaches the end of each stroke. It also keeps the engine from pounding.
Q. How much water would you blow off at any one time while running?
A. Never blow off more than one gauge.
Q. What are your general views regarding boiler explosions?
A. The greatest causes are from ignorance, carelessness and neglect.
Q. What precaution should you take if necessary to stop with a heavy fire in the furnace?
A. Close the draught door, and put the injector or pump at work.
Q. What is the proper height to carry water in the boiler?
A. About 2½ inches above top row of flues.