Formulae and Tables for the Calculation of Alternating Current Problems
by Louis Cohen
Format: Paperback
ISBN13: 9781154709407
Paperback|9781154709407
Out of Stock
Overview
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...which is due to the external magnetic field of the conductor. In Chapter II we have given a set of formula?, (65) to (71), for the calculations of the inductances of two, three, four and five wires in parallel, and we have also indicated a method for the approximate determination of the inductance of any number of wires in parallel; hence, knowing the inductance we can use formula (54) to determine the capacity. As an illustration let us consider an antenna of the following constants: a (radius of wire) = 0.08 in., d distance between adjacent wires = 2 feet, h height above ground = 80 feet, 10 wires in parallel and 150 feet long. Louis Cohen, Electrician, Feb. 21, 1913. The self inductance of a single wire, neglecting the internal magnetic field of the conductor, is T 2h 160X12 ia._ L = 2108.--= 21og- Q08 =18.65. The mutual inductance between two adjacent wires is, 4/i2 4 X 6400 M = log, --= log. = 8.76. By formula (70), Chapter II, we find the inductance of five wires in parallel, ' = 9.51 cms. per cm. The mutual inductance between two wires placed at a distance of 5 d is and the total inductance of the 10 wires in parallel is The capacity of the antenna is 1015Z 1015 X 150 X 30.5 = 0.00068 mf. Concentric Cylinders.--The capacity of a condenser formed by two concentric cylinders is Kl Fig. 31. If the dielectric between the cylinders is not homogeneous, but consists of several cylindrical layers of different specific inductive capacities, formula (55) assumes the form By comparing formulae (58) and (59) with (55) it is obvious from inspection that the capacity is a minimum when the axes of the cylinders coincide. As an illustration of the relative accuracy of formulas (58) and (59) the computed values of the capacities iron sheath and...
| ISBN-13 | 9781154709407 |
|---|---|
| ISBN-10 | 115470940X |
| Weight | 0.39 Pounds |
| Dimensions | 9.00 x 6.00 x 0.27 In |
| List Price | $14.14 |
| Format | Paperback |
|---|---|
| Pages | 112 pages |
| Publisher | |
| Published On | 2010-03-01 |
View All Offers
Sort by:
Price
