opens when the steam passes from the the hats are felted in a much superior manner. the fire is made to descend in a flue between safety valve to the " doctor " or steam pump, an outer cylinder and the fire chamber, and and allows of the steam passing from the safety CONTROLLING THE STEAM PRESSURE… … digger which is placed behind it scoops up the chamber. The annexed engravings are views of an in- a spring attached to the boiler and slotted arm the potatoes which are made to roll towards a Again, suppose the pipes, K and b, be con- vention for Controlling the Pressure of Steam which connects…
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