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
in thewire connecting the signal apparatus with the groundwire, and which, when the piston-rod rises throughthe hole of the cover, is closed by the action of asmall lever m, pivoted at one end, which is pushedhorizontally by coming in contact with the conic-ally-shaped end of the piston-rod.… … by connecting the spaces above and below the piston by air-passages, q, 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…
Mechanical engineering -- Dictionaries
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