The High Intensity Arc Lamp
THE remarkable record of engineering progress in the motion picture industry for many years marked little improvement in the light source used for the projection of the completed picture. During that period, the motion picture had passed from an adventure to an industry. Producers had equipped studios to secure unusual photographic and scenic effects. Exhibitors had built the-atres which were unrivalled in magnificence. The only notable change in the arc used for projection was a gradual increase in current to satisfy the longer throws, the added house lighting and the general demand of the public for a brighter picture. Arc amperes increased from 35 to even 150 with no compensating development along the lines of greater efficiency in light utilization or in light production.
- Print ISSN
- 0096-6460
- Published
- 1921-10
- Content type
- Original Research
- DOI
- 10.5594/J12482