Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 130
mil area of 4circular mils, the result being obtained by expressing the di-ameter of the wire in mils and squaring it (multiplying it byitself). The circular mil is used as the unit of area in thecalculation of round wires for electrical purposes (the squaremil for rectangular wires). It is the… … RESISTANCE. Ill a diameter of ToVtt mcn > hence the square of any diameter, expressed in thousandths of an inch, will give as a product the number of circular units that can be placed side by side in a square, the sides of which are equal to the diameter that has been squared, the united area of…
Electricity · Magnetism
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