Twentieth century hand-book for steam engineers and electricians, with questions and answers .. (1905)
Swingle, C. F. [from old catalog], Horstmann, Henry Charles, 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] · Chicago, F. J. Drake & co. · leaf 445
FIGURE 12. 26 ELECTRICITY FOR ENGINEERS quarter-circle from one adjacent corner to the otheradjacent corner, the area inscribed by the compasswould again be .7854 of a square inch. The above will explain to the reader the relation … figure 13, between the circular and square mil. The circularmil is a circle one mil (-joVo °f an inch) in diameter.The square mil is a square one mil long on each side.In the calculation of wires for electrical purposes, thecircular mil is generally used, because we need onlymultiply the diameter…
