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ART. 265 - On the Stresses in Solid Bodies due to Unequal Heating, and on the Double Refraction resulting therefrom

Published online by Cambridge University Press:  05 July 2011

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Summary

The phenomena of light and colour exhibited in the polariscope when strained glass is interposed between crossed nicols are well known to every student of optics. The strain may be of a permanent character, as in glass imperfectly annealed or specially unannealed, or it may be temporary, due to variations of temperature or to mechanical force applied from without. One of the best examples under the last head is that of a rectangular bar subjected to flexure, the plane of the flexure being perpendicular to the course of the light. The full effect is obtained when the length of the bar is at 45° to the direction of polarization. The revival of light is a maximum at the edges, where the material traversed is most stretched or compressed, while down the middle a dark bar is seen representing the “neutral axis.” It is especially to be noted that the effect is due to the glass being unequally stretched in the two directions perpendicular to the line of vision. Thus in the case under discussion no force is operative perpendicular to the length of the bar. Under a purely hydrostatic pressure the singly refracting character of the material would not be disturbed.

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Scientific Papers , pp. 502 - 510
Publisher: Cambridge University Press
Print publication year: 2009
First published in: 1903

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