Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 8, August 1941)

[ACTIVE]

Improved Motor Drive for Self-Phasing of Process Projection Equipment

Metadata

Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Process projection photography requires that the shutter of the projector and that of the camera open and close simultaneously. The relation between the shutter speeds and the pole frequencies of normal motion picture motor systems is such that there may be one, four, or five incorrect shutter relationships for each correct one, if the motors are interlocked at random. Earlier methods of insuring correct phasing between camera and projector shutters did not take proper account of the economic importance of fast and reliable operation. This paper presents the results of a time and economic study indicating savings of many thousands of dollars annually per studio, accruing from the use of a motor system which automatically phases the shutters of camera and projector, and which has a very high degree of reliability. The design and performance features of such a motor system are described in their relation to earlier efforts along this same line, together with a report on production use of the new system.
Publication Date: 1941-08-01
DOI: 10.5594/J12895
Link: https://doi.org/10.5594/J12895
Author(s): Homer Tasker

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J12895.json

Reference this Doc

Plain text (ISO 690 compliant)

Preview:

Homer Tasker; Improved Motor Drive for Self-Phasing of Process Projection Equipment, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 8, August 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12895

Snippet:

Homer Tasker; Improved Motor Drive for Self-Phasing of Process Projection Equipment, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 8, August 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12895

HTML (ISO 690 compliant)

Preview:

Snippet:

<span class="citation">Homer Tasker; <cite>Improved Motor Drive for Self-Phasing of Process Projection Equipment</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 8, August 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J12895" target="_blank" rel="noopener">https://doi.org/10.5594/J12895</a></span>

SMPTE's HTML Pub

Preview:

Snippet:

<li>
Homer Tasker; <cite id="bib-10-5594-j12895">Improved Motor Drive for Self-Phasing of Process Projection Equipment</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 8, August 1941); SMPTE, 1941
<span class="doi">10.5594/J12895</span>
</li>