Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 424
connect directly with the gate,nor is there always a lever, but the rise or fall of the balls acts on some mech-anism which performs the function of reducing or increasing the supply ofsteam or water. The size of the balls depends somewhat on the work to be done, the resist-ance to be overcome in…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
