ft Ma y 18 > 1882.^— 3 p.m.— Tait Experiments by C.P.S.— As to effect of change of Azimuth on Spectrum-place of 
Sodium lines, viewed by electric illumination of 1 inch induction sparks, in an end-on Gas- vacuum tube. 2nd 
228 Proceedings of Royal Society of „ Edinburgh , 
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