Filtering Factors of the Magnetic Drive
A laboratory model of a magnetic-drive film-phonograph was modified so that speed fluctuations of large and measurable magnitude and of frequencies ranging from 1/2 to 7 cycles could be introduced either into the sprocket rotation or the magnet rotation. The resulting speed variations at the drum were determined by means of a “wowmeter.” The large ratios of flutter reduction indicated by these measurements show in part why the magnetic drive gives unsurpassed film motion.
- Print ISSN
- 0097-5834
- Published
- 1940-08
- Content type
- Original Research
- DOI
- 10.5594/J10057
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