Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 4, October 1931)

[ACTIVE]

A New 35-MM. Portable Projector

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A new 35-mm. portable projector is described. The optical system consists of either the T-20, 900-watt or T-20, 1000-watt lamp, Bausch and Lomb Cinephor condensers, and the lens mounts are so constructed as to take full-size professional no. 2 or series II lenses. The projector is of the straight-through threading type. All the operating parts are directly connected to the motor, no belts being used. Framing is accomplished by the rotating-sprocket method. A new type of sound gate without tension shoes forms part of the equipment. The revolving shutter is placed between the projection lamp and the aperture, and functions also as an automatic fire shutter. The equipment is entirely enclosed within its own case and weighs approximately 100 lbs.
Publication Date: 1931-10-01
DOI: 10.5594/J05575
Link: https://doi.org/10.5594/J05575
Author(s): Herbert Griffin

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Herbert Griffin; A New 35-MM. Portable Projector, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 4, October 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J05575

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Herbert Griffin; A New 35-MM. Portable Projector, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 4, October 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J05575

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Herbert Griffin; A New 35-MM. Portable Projector, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 4, October 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J05575

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<span class="citation">Herbert Griffin; <cite>A New 35-MM. Portable Projector</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 4, October 1931); SMPTE, 1931. Available at <a href="https://doi.org/10.5594/J05575" target="_blank" rel="noopener">https://doi.org/10.5594/J05575</a></span>

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Herbert Griffin; A New 35-MM. Portable Projector, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 4, October 1931); SMPTE, 1931
doi: 10.5594/J05575
url: https://doi.org/10.5594/J05575

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<li>
Herbert Griffin; <cite id="bib-10-5594-j05575">A New 35-MM. Portable Projector</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 4, October 1931); SMPTE, 1931
<span class="doi">10.5594/J05575</span>
</li>