Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 17
Fig. 3. Crowfoot. Fig. 4. Star. There are two styles of zincs, tlie Crowfoot,Fig. 3, and tlie Star, Fig. 4. In making up your battery the blue vitriol shouldbe placed around the copper as in Fig. 1, and waterpoured into the jar until it covers the feet of thezinc. Where dry battery is used it is… … Fig. 5. Dry Battery. MANUAL OF TELEGRAPHY. Battery. 15
Telegraph
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