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 884
, andhaving on one end a button. When this button is pressed down two platinum wires, a and b, arebrought into contact, thus closing the circuit; when the pressure is removed a spring lifts the lever,separates the wires, and breaks the circuit. When the message is sent, the operator… … intervals or waves—the short waves by a momentary depression of the key-lever, and the long wavesby a depression of longer duration. These waves, passing over the wires to the distant station, actu-ate the recording mechanism, making long and short indentations on a continuous strip of paper. Tlie…
Mechanical engineering -- Dictionaries
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