Telegraphy and how to learn it; with brief chapters on elementary science, embracing various kinds of electricity, electrical measurements, thermo-frictional electricty, batteries, magnets and magnetism (1901)
Frederic, Wilson. [from old catalog] · Chicago, The Henneberry co · leaf 81
les, forms and methods of the line beforeattempting the management himself. Most operatorscommence theircareer upon rail-road lines, andmore fail in thefirst attempt fromnot comprehendingthe responsibilitiesand duties thanfrom incapacity totelegraph. A fewhints may not be FIG. 15 out of place.… … FRICTIONAL ELECTRICITY. ?9 sage to remain undelivered in the office, ora message to hang unsent on the hooks.Dont be afraid or ashamed to break/ orask for information—better fifty breaks orquestions than one error. HOW TO PUT THE BATTERY INIOPERATION. Fill the glass jar about two-thirds full…
Telegraph
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