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Report of tJie Progress Committee 77
instances have been mentioned of it having been done over telephone lines for considerable distances but the degree of success is not known.
Instead of using a separate film for the reproduction of the sound, or a very narrow track on which the smallest defect is of considerable importance, Establissements L. Gaumont are reported to be working on a method for reproducing the sound image on a thin film coated with bichromated gelatin.^^^ Aft^r treatment the gelatin relief is dyed with esculine and cemented with gelatin on the back face of the scene film. The base of the latter is thinner than the usual stock and the pictures are made up exclusively of dyes transparent to the ultra violet, which is absorbed by the esculine. The stimulation of the photo electric cell by the ultra violet is not interfered with by the scene image, and the cinematographic projection is not impeded by the esculine which is transparent to visible radiations.
The desirable properties of glass windows for sound proof booths have been discussed.^^*^ An opaque film with the picture record on one side and the sound record on the opposite side has been described; both images are projected by reflection.^^''
Certain difficulties encountered in acoustic measurements of the performance of loud speakers have been described.^^^ Because of the nature of these difficulties it has not yet been possible to specify a complete and simple set of measurements or conditions which will completely express the performance of a loud speaker. Data have been given showing the performance of tw^o representative types of loud speakers both when measured in outdoor space free from reflections and when measured under varying conditions in a specially treated acoustic laboratory. The differences serve to emphasize the importance of certain precautions in the making of indoor acoustic measurements.
A radical experiment in sound picture production is contemplated in New York. It consists in remaking a picture in French immediately after the English version has been completed. French actors from the French theatre will be used. Similar plans are under way for actors of other nationalities to make foreign distribution of American sound pictures possible.^^^
Numerous patents have been issued dealing with a great many phases of sound recording processes. ^-°