Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 382
Fig. 3,400.—beam of radial rays of light projected from search light with dispersion lenses. B B … Pig. 3,401.—Front view of a search light showing arrangement of dispersion lenses. The objectof these lenses is to project the rays radially as in fig. 3,400 instead of parallelly as in fig.3,401. The dispersion lenses as here shown are arranged in two semicircular brass rings A, A, so pivoted that…
Electrical engineering
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