Bulletin of the Bureau of Standards, Vol. 3: Issued April, 1907 (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Bulletin of the Bureau of Standards, Vol. 3: Issued April, 1907

If the area be subdivided into 72 equal squares, it may be taken to represent the section of a circular coil wound with square wire, the latter being insulated by a covering of infinitesimal thickness. The self-inductance of such a coil is n times as great as that of a single ring occupying the same space. Hence by inserting 2 as a factor in the expression previously derived the formula for the self inductance of a coil of wire of 7: turns, mean radius a, axial width b, and radial depth 5 was derived by Weinstein.' Stefan' put the formula into more convenient form for calcula tion by combining several terms which depend only on the ratio of b to a into two terms, y, and y,, the values of which could be taken from tables prepared by him for the purpose. Stefan's formula is as follows.

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