FR493847A -
Method and apparatus for scientific cinematography allowing the projection of immobilized film fragments without danger of fire or charring for the film
- Google Patents
Method and apparatus for scientific cinematography allowing the projection of immobilized film fragments without danger of fire or charring for the film
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CHARLES VELSEN
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CHARLES VELSEN
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Application filed by CHARLES VELSENfiledCriticalCHARLES VELSEN
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Publication of FR493847ApublicationCriticalpatent/FR493847A/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
G03B21/14—Details
G03B21/18—Fire preventing or extinguishing
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Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR493847D1917-01-151918-03-29
Method and apparatus for scientific cinematography allowing the projection of immobilized film fragments without danger of fire or charring for the film
ExpiredFR493847A
(en)
Method and apparatus for scientific cinematography allowing the projection of immobilized film fragments without danger of fire or charring for the film
Method and apparatus for scientific cinematography allowing the projection of immobilized film fragments without danger of fire or charring for the film