History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 135
ened to the floor; the airis compressed in the chamber I, fourteeninches long, and six in diameter, lying be-neath the mahogany case H; it is furnishedwith a safety-valve, to permit the escape ofredundant air not needed in the economy ofthe machine. The composing system has an insulatediron frame,… … HOUSES PBWTING TELEGRAPH. 117 cylinder B; it is made to revolve by a band playing over thepulley D, fixed to the left extremity of it. The cylinder, i?is detached from the shaft, but made to revolve with it by afriction contrivance, consisting of a brass flange fastened perma-nently to the…
Telegraph
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