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. 1896 Excerpt: ...the value of 2 TV is found by a sudden reversal of the current. In many ways this is more convenient than the former method, and is quite accurate for soft iron; with hard iron it is not so accurate. Experiment 63. Magnetic qualities of iron. Instantaneous contact method. The relation between the magnetizing force and ...
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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. 1896 Excerpt: ...the value of 2 TV is found by a sudden reversal of the current. In many ways this is more convenient than the former method, and is quite accurate for soft iron; with hard iron it is not so accurate. Experiment 63. Magnetic qualities of iron. Instantaneous contact method. The relation between the magnetizing force and the magnetic induction in an iron ring may be found by a method due to Drs. J. and B. Hopkinson, in which the method of instantaneous London Electrician, Vol. 29, p. 511; September 9, 1892. Also, Gray's Absolute Measurements in Electricity and Magnetism, Vol. 2, Part 2, p. 752. contact is employed to obtain the instantaneous values of an alternating current passing through the magnetizing coil, and of the impressed electromotive force. The iron to be tested is in the form of a ring, and is well laminated to prevent eddy currents. The lamination is best obtained if the ring is formed of iron wire. The ring is wound uniformly with the magnetizing coil, and is connected in series with the non-inductive resistance R, as shown in Fig. 122. An alternating current is passed through the resistance and the magnetizing coil. By one of the methods of instantaneous contact already described, the instantaneous values are found of the potential differences between the points a and b at the extremities of the resistance, and between the points b and c at the terminals of the magnetizing coil. From the readings between a and b a curve is plotted to represent the current. This curve, which we will call curve I., is not here shown. A second curve, II., is plotted from the readings between b and c, to represent the value of the electromotive force at the terminals of the coil; that is, where RJ is the electromotive force to overcome the ohmic resistance of the c...
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Add this copy of A Laboratory Manual of Physics and Applied Electricity, to cart. $67.25, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2010 by Nabu Press.
