History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 257
TURN THE CRANKSIXTIMES.SLOWLY. C … Fig. 75. nal-box, the number of the fire district, and also the number ofthe box or station itself, in its district, are marked; and the placein the neighborhood where the key-holder may be found is alsoprominently notified. On opening the door of the signal-box, acrank is seen. Connected with this…
Telegraph
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