History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 520
he compressed air from the reservoir beneath the table alter-nately into each end of a chamber, G, as the valve rises and fallsunder the action of the spring and of the electro-magnet. A piston,moving air-tight in the chamber G, operates the printing machinery THE PROGRESS OF THE ELECTRIC… … piston, acting on the escapement lever H, releases one of the six pinsh, h, of the timing wheel /, which is moved by a friction attachment, 502 THE PROGRESS OF THE ELECTRIC TELEGRAPH. g, so that it can hz stopped at pleasure without interfering with themovement of other parts. The type-wheel J is…
Telegraph
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