Abstract
MAY I make the following remarks concerning Mr. A. C. Menzies' letter in NATURE of Oct. 5, p. 511, on the “Raman Effect from Powdered Crystals”. For several months I have been engaged in studying the Raman effect from different crystalline powders, and I can corroborate Mr. Menzies' statement that the reflection of the incident radiation by such powders is no obstacle in observing at least the stronger Raman lines. I tried several ways of obtaining Raman spectrograms, and found that the best results could be secured when the powdered crystals were filled into a rectangular plate-glass vessel of a few cubic centimetres contents, on which the light of a mercury arc was focused through one side surface, while the secondary radiation was observed by putting the spectrograph as close as possible to another side of the vessel perpendicular to that where the primary radiation entered.
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