The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 530
Fig. 327. Breguets Capillary Telephone. The point of a glass tube, drawn out at its lower end to a capillaryopening dips vertically into a vessel. This vessel is partly rilledwith mercury, over which is a layer of dilute sulphuric acid. Theend of the immersed tube dips into the acid, but does not…
Electricity
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