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Expired
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Eduard Otto Zechmann
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Individual
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Individual
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Publication of GB190817285ApublicationCriticalpatent/GB190817285A/en
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
G03B21/54—Accessories
G03B21/56—Projection screens
G03B21/60—Projection screens characterised by the nature of the surface
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
Overhead Projectors And Projection Screens
(AREA)
Abstract
17,285. Zechmann, E. O. Aug. 17. Optical projection apparatus.-A screen for receiving kinematographic &c. pictures said to render them visible in daylight consists of glass &c., matted, etched, lined, &c. on one side a' and provided on the other side a<2> with a reflecting. layer. The screen may be suitably curved and be fitted in a frame c lined with black.
GB190817285D1908-08-171908-08-17Improved Screen for Projection in Light Rooms and like purposes
ExpiredGB190817285A
(en)