Abstract :
Searchlights have remained practically the same for the past 25 years, although there is great necessity of an improved searchlight on account of the increased range of torpedoes and increased speed of torpedo boats. The constituent parts of a searchlight are given in the paper and some of the essential and desirable features of the various parts are shown. Methods of testing searchlight mirrors are given, with illustrative figures. The results of tests conducted on Navy standard 36-in. and 60-in. searchlights and Beck 44-in. searchlight show the latter type to be much more efficient in illuminating distant objects. Relative results are shown in the figures.
