A Dictionary of Applied Physics. Edited by Sir Richard Glaze-
brook, K.C.B., F.R.S. Vol. IV. (Macmillan. 63s. net.)
The new volume of this admirably concise and authoritative work of reference (by the editing of which Sir Richard Glaze- brook is conferring so great a benefit on general students of physics) deals, in a single alphabet, with the subjects of Light, Sound and Radiology. Among the longest articles we may note those of Mr. Tudor Walsh on " Photometry and Illumination," Dr. Barton on " Sound," and Mr. Coad- Pryor on " Glass." A special feature of the work is the amount of space given to articles on instruments, such as those on the piano, the piano-player and the gramophone, the periscope and the range-finder, surveying and naviga- tional instruments, cameras and telescopes. The information is up to date and as a rule the exposition is clear.
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