The industries of the world; a complete course of technical education for the manufacturer, operative, and all persons engaged or interested in trade and commerce (1881)
Wylde, James · London, New York, The London Printing and Publishing Company, limited · leaf 548
apparatus to produce forms of such apparatus, we may suggest a few simple experiments, by which the general prin¬ an electro-motive force suitable in all respects ciple of some of them will be elucidated and for the requirements of an ocean telegraph illustrated. [patented June, 1852], consists in… … combined w.ith minimum quantity, and in all bluish-purple tint, Fig. 275. respects that which is absolutely necessary due to the pre¬ and required for extended submarine circuits. sence of the litmus. But if the wires from one Besides, as by these means of reversing the or two voltaic cells be…
Industrial arts · Technology
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