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Expired
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Hector Duffau
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Individual
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Individual
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G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
G03B21/00—Projectors or projection-type viewers; Accessories therefor
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Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
Projection Apparatus
(AREA)
Lenses
(AREA)
Abstract
2767. Duffau, H. Feb. 3. Optical-projection apparatus.-A series of advertisements &c. V are projected by means of a single source S and a system of lenses L<1>, L<2>, L<3>, mirrors M<1>, M<2>, M<3> being placed between the source and the lenses to produce a number of virtual foci S', S2, S<3>.
GB191102767D1911-02-031911-02-03Improvements in Apparatus for Projecting Illuminated Advertisements and such like.
ExpiredGB191102767A
(en)