Abstract
THE use of searchlights has rapidly extended during recent years, with the result that the want of a good treatise, dealing with their principles of construction and the methods of using them, has made itself acutely felt. The volume at present under review is a translation of the treatise on searchlights in Prof. Volt's “Sammlung elektrotechnische Vortrage,” but much new matter has been added, so that it now forms an epitome of the latest practice. After dealing with the optical principles utilised in the construction of searchlights, special attention being paid to parabolic mirrors, the performance of searchlights and the methods of testing their mirrors are discussed. The applications of searchlights in the field, in land fortresses, for coast defence, and on battleships then receive attention. For field purposes a light equipment is now obtainable, consisting of a waggon carrying a petrol motor and a dynamo, coupled to another waggon which carries the searchlight and a transportable tower for elevating it. Searchlight equipments for fortresses may be either fixed, partially movable, or wholly movable; each type receives adequate consideration.
Searchlights: their Theory, Construction, and Application.
By F. Nerz. Translated by Charles Rogers. Pp. vii + 137. (London: Archibald Constable and Co., Ltd., 1907.) Price 7s. 6d. net.
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E., E. Searchlights: their Theory, Construction, and Application . Nature 77, 460 (1908). https://doi.org/10.1038/077460b0
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DOI: https://doi.org/10.1038/077460b0