Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 804
t, o, in which a small valves opens communication freely when the air is flowing from above the piston to below it, but leavesonly a small opening when the direction of the air-current is reversed. The signal apparatus is shown in Figs. 3936 and 3937, representing its front and side elevations.It… … sition. It is brought from the first into the second position by the action of an electro-magnet, andis held so by means of a mechanical support. It is brought back into the depressed position by itsown gravitation, the mechanical support being removed by the action of another electro-magnet.This…
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