History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 259
from the central station, andthe revolution of the train of wheels raises also the falling leverinto its place, and catches it again on the armature lever, readyto be disengaged or tripped for another blow. At the central station, connected with the alarm circuit, is amagneto-electric machine,… … Fig. 76. THE ELECTRIC TELEGRAPH. 241 and inconvenience of maintaining a large quantity battery to workthe alarm-circuits. An ingenious arrangement of a cylinder (Fig. 7G) carried byclock-work, upon the circumference of which are metal platesconnected with the several alarm-circuits, enables the…
Telegraph
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