Abstract
THIS completely revised edition of Mr. Lewis Wright's book is very welcome. We are glad to see that the oil-lantern, which is so handy in small class-rooms and in the huts of camps, is still regarded as a possible projector. It may be mentioned that if this lantern is filled for each occasion, and set up lighted in an adjacent room, or, better still, in the school-yard, for forty minutes or so before the lecture, all risk of producing offensive fumes will be avoided. In regard to screens for such class-rooms, may we add that a square of mounted diagram-paper, which is made 5 ft. wide, gives an excellent surface, and can be kept rolled up and fixed with large drawing-pins as required? Lastly, when Mr. R. S. Wright gives suggestions as to flash-signals, should be even tolerate the “nextslide” system of communication with the operator? The recently introduced silent wave of the pointer has escaped mention in this useful treatise.
Optical Projection.
By Lewis Wright. Fifth edition, rewritten and brought up to date by Russell S. Wright. (In two parts.) Part i., The Projection of Lantern Slides. Pp. viii + 87. (London: Longmans, Greenland Co., 1920.) Price 4s. 6d. net.
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C., G. Optical Projection . Nature 105, 773 (1920). https://doi.org/10.1038/105773a0
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DOI: https://doi.org/10.1038/105773a0