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Expired
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GB1079339A
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Individual
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Individual
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Priority to GB1079339ApriorityCriticalpatent/GB514936A/en
Publication of GB514936ApublicationCriticalpatent/GB514936A/en
F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
F21V7/00—Reflectors for light sources
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Engineering & Computer Science
(AREA)
General Engineering & Computer Science
(AREA)
Non-Portable Lighting Devices Or Systems Thereof
(AREA)
Abstract
514,936. Projector lamps. WALTER, F. C. Oct. 27, 1938, No. 10793/39, Divided out of 514,201. [Classes 75 (ii) and 75 (iv)] A projector lamp comprises a bulb D having its filament E at the focus of a truncated ellipsoidal reflector A, the latter being closed at its larger end by a concave ellipsoidal reflector B and enclosing a third reflector of semiellipsoidal form.
GB1079339A1938-10-271938-10-27An improved light projecting system
ExpiredGB514936A
(en)