Uploaded September 2013 | Updated September 2026, 3 weeks ago
A short reel from the "Excursions in Science" series extolling the uses of the phototube, a light sensitive device that generates a current. Coupled with a thyratron, the phototube can control a camera and automatically capture the "photo finish" of a horse race. Use of phototubes in talking motion pictures.
A short reel from the "Excursions in Science" series extolling the uses of the phototube, a light sensitive device that generates a current. Coupled with a thyratron, the phototube can control a camera and automatically capture the "photo finish" of a horse race. Use of phototubes in talking motion pictures.
