Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 212
pivoted at e, by catch T,pivoted at a, and by controlling lever £, pivoted at d.Signal wheel W and gear wheel G are mounted on the sameshaft and are driven by the main driving wheel D underthe influence of the spiral spring 5, the signal wheel mak- MUNICIPAL TELEGRAPHS 197 ing 8 revolutions during… … Fig. 4. the pawl rests in slot p or p of the upwardly-extendingflange of driving wheel D. When the hook H is pulled, thelocking lever B is raised, carrying with it insulating block/, thereby opening contacts C At the same time thepawl is raised out of slot p and the mechanism is set in iqS…
Telegraph
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