Abstract
1. The dispersion of the double refraction induced by stress in isotropic transparent substances has been the subject of a number of investigations. All of these, however, have dealt with compound substances, such as ordinary glasses and nitro-cellulose. It appeared of interest to obtain data, as accurate as possible, for a substance of glassy type, containing only a single chemical constituent, and in which the complications arising from progessive creep (such as occurs in nitro-cellulose and gelatine) were absent. Vitreous silica provides such a material and is now obtainable in fair-sized blocks of good optical quality. 2. Two rectangular blocks of vitreous silica were obtained from the Thermal Syndicate, Ltd. Their dimensions were as follows:
a
(the height) being parallel to the line of stress,
b
(the height) being at right angles to both the line of stress and the rays of light, and
d
(the thickness) being in the direction of travel of the light through the block:- A.
a
= 2.142,
b
= 0.467,
d
= 0.902. B.
a
= 4.270,
b
= 1.228,
d
= 3.250.
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