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. 1904 Excerpt: ...such as insulating oils, the dielectric may be broken down by a disruptive discharge, but the damage is immediately repaired by the inflow of the insulating fluid. By subjecting plate glass to powerful electrostatic stress and passing plane polarized light through it at right angles to the lines of force, Kerr ...
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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. 1904 Excerpt: ...such as insulating oils, the dielectric may be broken down by a disruptive discharge, but the damage is immediately repaired by the inflow of the insulating fluid. By subjecting plate glass to powerful electrostatic stress and passing plane polarized light through it at right angles to the lines of force, Kerr discovered that glass becomes doubly refracting, and is strained as if it were com. pressed along lines of force. Quartz behaves in the same way, but resins and all insulating fluids examined, except olive oil, act as if extended along lines of force. The action requires about thirty seconds to reach its maximum effect, and about the same time is required for complete recovery. Kohlrausch and others have pointed out the analogy between Kerr's discovery and the elastic fatigue of solids after being subjected to a twisting strain. A fibre of glass if twisted does not immediately regain its initial form when released from the stress, but a slight set remains from which it slowly recovers. The glass of a charged jar is then greatly strained, and it does not at once recover when the jar is discharged. Its after-recovery from distortion sets free energy which is represented by the residual charge. Hopkinson has shown that it is possible to superpose several residual charges of opposite signs. In the same way a glass fibre may be twisted first in one direction and then the other, and the residual twists will appear in reverse order. No residual charges can be obtained from air condensers, nor from those with quartz plates. Correspondingly, quartz shows no elastic fatigue after being twisted. Siemens has shown that the glass of a Leyden jar is sensibly warmed by rapid charging and discharging. The distortion shows a lag behind the electric stress, a phenomeno...
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Add this copy of Physics for University Students, Volume 2 to cart. $70.47, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2011 by Nabu Press.
