History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 111
oard itself stands upon four metal or wooden balls, and is so con-structed that the striking of the lever upon the brass standardcauses a loud and distinct sound, which is audible, in a quietplace, a couple of rods distant. The brass standard contains anadjusting apparatus, which enables the… … Fig 43. recording apparatus. But there has arisen from this a great sav-ing in the force necessary for doing a large business over thewires, as may be easily imagined from the fact that only one per-son is now necessary to receive and copy despatches where twowere formerly required. It was soon…
Telegraph
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