The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 138
heat-stone bridge is used in the method and calculations. Coil, Earth. A coil of wire mounted with commutator to berotated so as to cut the lines of force of the earths magnetic field,thereby generating potential difference. The axis of rotation maybe horizontal, when the potential will be due to… … Fig. 99, Delezennes Circle or Earth Coil. Coil, Electric. A coil of wire used to establish a magnetic field bypassing a current through it. The wire is either insulated, or sospaced that its convolutions do not touch. Coil, Flat. A coil whose windings all lie in one plane, making asort of disc, or…
Electricity
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