Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 6, December 1945)

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A New Carbon for Increased Light in Studio and Theater Projection

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A crater brightness of as much as 1400 candles per sq mm is produced by a new 13.6-mm super high-intensity positive carbon. This brightness is obtained at 290 amp using water-cooled jaws of special design. With conventional positive carbon jaws, a crater brightness of 1200 candles per sq mm is obtained at 265 amp. The burning rate of the positive carbon in both cases is approximately 45 in. per hr. Tests of these carbons with a relay condenser optical system indicate possibility of a 30 to 45 per cent increase in quantity of screen light for transparency process projection. Measurements with a standard condenser optical system of the type used in theater projection show increases of 40 to 60 per cent over standard carbons. Mention is made of the necessity of adequate provisions in order that the components of the projection system can accommodate the faster burning rate, higher power and higher intensity of radiant energy associated with the operation of the new carbons.
Publication Date: 1945-12-01
DOI: 10.5594/J11875
Link: https://doi.org/10.5594/J11875
Author(s): M. T. Jones, R. J. Zavesky, W. W. Lozier

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M. T. Jones, R. J. Zavesky, and W. W. Lozier; A New Carbon for Increased Light in Studio and Theater Projection, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 6, December 1945); SMPTE, 1945. Available at https://doi.org/10.5594/J11875

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M. T. Jones, R. J. Zavesky, and W. W. Lozier; A New Carbon for Increased Light in Studio and Theater Projection, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 6, December 1945); SMPTE, 1945. Available at https://doi.org/10.5594/J11875

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<span class="citation">M. T. Jones, R. J. Zavesky, and W. W. Lozier; <cite>A New Carbon for Increased Light in Studio and Theater Projection</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 6, December 1945); SMPTE, 1945. Available at <a href="https://doi.org/10.5594/J11875" target="_blank" rel="noopener">https://doi.org/10.5594/J11875</a></span>

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<li>
M. T. Jones, R. J. Zavesky, and W. W. Lozier; <cite id="bib-10-5594-j11875">A New Carbon for Increased Light in Studio and Theater Projection</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 6, December 1945); SMPTE, 1945
<span class="doi">10.5594/J11875</span>
</li>