. Practical wireless telegraphy; a complete text book for students of radio communication . f coil in centimeters, n = total number of turns, b = length of coil in centimeters, 2 aK ^ a constant varying as the ratio . 2a . Values of K for — appears in the curves of Fig. 230. b If the dimensions ofthe coil are given in inches, the student can convert them to centi-meters by multiplying by (1 inch = centimeters). Also the radius is one-half the 2adiameter, hence the ratio of — is readily obtained, and the corresponding value of K from the 2acurve. Thus if — = , then K = (o) E
. Practical wireless telegraphy; a complete text book for students of radio communication . f coil in centimeters, n = total number of turns, b = length of coil in centimeters, 2 aK ^ a constant varying as the ratio . 2a . Values of K for — appears in the curves of Fig. 230. b If the dimensions ofthe coil are given in inches, the student can convert them to centi-meters by multiplying by (1 inch = centimeters). Also the radius is one-half the 2adiameter, hence the ratio of — is readily obtained, and the corresponding value of K from the 2acurve. Thus if — = , then K = (o) Example 1.—Assume a coil of 10 turns with mean diameter of 18 inches, and overalllength including the insulation (if any) of inches. The inductance is calculated as follows:n = 10 turns;b = centimeters;a = centimeters;2a 18 — = — = and from Fig. 230 K = () X (10) Therefore L = ^i^ ■ X or 53,825 centimeters. •Presented by Wm. H. Priess in the August, 191S, issue of the Wireless Age. 210 PRACTICAL WIRELESS TELEGRAPHY. ie««l. OB 4 PRACTICAL RADIO MEASUREMENTS. 211 (6) Example 2.—Calculate the inductance of a coil three inches in diameter, 8 inches inlength, wound closely with No. 26 double silk-covered wire. From the table on page 213 thediameter of No. 26 D. S. C. wire is .02014 inches, hence, 8 n = ■ = 397 turns; = centimeters;a =: — = ^ = , and from Fig. 196bK = () X (397)= Therefore L = 4^ X , or 3,820,000 centimeters.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
