. The London, Edinburgh and Dublin philosophical magazine and journal of science. , * Drapers Company Research Memoirs. Technical Series. I. 1904. Optical Determination of Stress. 751 where p0 is the mean radius of curvature, c is the distance ofthe applied force from the centre of the section, and yu y2are constants depending on p0, 77, and T. In the present casery1= 1*048, 72 = 891, where 77 = *39, and the position of theneutral axis is 055 in. from the centre on the tension side. Fi-. .o-&1 This agrees fairly well with the observed value of *059 regard to the fact that p0 is i
. The London, Edinburgh and Dublin philosophical magazine and journal of science. , * Drapers Company Research Memoirs. Technical Series. I. 1904. Optical Determination of Stress. 751 where p0 is the mean radius of curvature, c is the distance ofthe applied force from the centre of the section, and yu y2are constants depending on p0, 77, and T. In the present casery1= 1*048, 72 = 891, where 77 = *39, and the position of theneutral axis is 055 in. from the centre on the tension side. Fi-. .o-&1 This agrees fairly well with the observed value of *059 regard to the fact that p0 is increased about 10 percent, of its original value by the load. Owing to the uncertainty of the exact position of theforces when a ring of such great curvature is stressed andsomewhat distorted by a load, it has not been possible withthe apparatus at my present disposal to establish any veryaccurate relationship between the external and internalforces. The present examples, however, serve to illustrate thepractical uses which it is possible to make of this method ofanalysing the stresses produced in any object capable ofbeing represented in a plane by a model cut from a sheet oftransparent material. [ ?52 ] LXXXIII. Rays of Positive Sir J. J. Thomson *. TFIND that the investigation of the Positive Rays orCanalstrahlen is made much easier by using very largevessels for the discharge-tube in which the rays are large vessels the dark space around the catho
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