Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 215
ed by a ratchet-lever (not shown) and the box numberwill not be transmitted. The appearance of the non-interfering successive signal 200 TELEGRAPH ENGINEERING box made by the Star Electric Company is shown in Fig. 5.This box is equipped with a mechanism capable of repeat-ing its signal number forty… … Fig. 5. devices on the box circuit, a protector against abnormalcurrents, a lightning arrester and a grounding switch. Fire-alarm boxes that are wound by the act of pullingthe starting lever, termed sector boxes, are also used, themechanisms being driven either by springs or weights. 3. Public…
Telegraph
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