the portable consists of a projector designed to accommodate standard 35 m.m. film. it operates from a power source of 110 volts, 60 cycle alternating current (adaptable to direct), and has a standard sound film speed of 90 feet a minute. A picture 6 by 8 feet can be projected at a distance of 50 feet (pictures of other dimensions are possible with different lenses). The photograph at the left shows the interior of the projector. The demonstrator is pointing to the little photo-electric cell tube that has. made talking pictures possible. Note the film. Right.—A close-up view of the lamp-house, showing the ordinary electric light, bulb which is used for projecting the picture. —Underwood and Underwood, photos.
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Bibliographic details
Dominion, Volume 23, Issue 54, 27 November 1929, Page 9
Word Count
118the portable consists of a projector designed to accommodate standard 35 m.m. film. it operates from a power source of 110 volts, 60 cycle alternating current (adaptable to direct), and has a standard sound film speed of 90 feet a minute. A picture 6 by 8 feet can be projected at a distance of 50 feet (pictures of other dimensions are possible with different lenses). The photograph at the left shows the interior of the projector. The demonstrator is pointing to the little photo-electric cell tube that has. made talking pictures possible. Note the film. Right.—A close-up view of the lamp-house, showing the ordinary electric light, bulb which is used for projecting the picture. —Underwood and Underwood, photos. Dominion, Volume 23, Issue 54, 27 November 1929, Page 9
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