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Report of the Progress Committee 69
emulsion characteristics during the past six months. The properties of panchromatic films of several manufacturers have been discussed.^' ^' ^ The reports show notable increases in red sensitiveness, thus making the emulsions more useful for sets illuminated with incandescent light. The results on tests on halation, latitude, and other properties of Agfa duplicating film have been published.* New negative emulsions especially adapted to the recording of sound have been announced.^' ^
A few papers on emulsion technic have appeared. These dealt with principles of continuous drying of emulsion coatings,^ preparation of highly sensitive negative emulsions,^ and a resume of patent specifications.®
A review of recent patent literature indicates extensive experimentation on the improvement of cellulose acetate and its derivatives for use as film support.^° Tests on a new non-inflammable positive film indicate that it lacks the usual brittleness of acetate base.^^ Only a few patents have appeared on improvements in nitrate support.^^ One author describes methods of making cellulose acetonitrate with the object of obtaining the desirable plastic properties of nitrate and the slow burning characteristics of acetate film base.^^
One additional patent^* has been accepted to the long group issued during the last few years on methods of improving emulsion sensitiveness by the addition of sulfur compounds during manufacture. Certain protein extracts have also been disclosed as sensitizers for gelatin.^^
A French patent deals with the application of a plastic heat resisting layer to the emulsion side of photographic films.^^ Several new disclosures have been made concerning treatments of cellulosic film support for the prevention of electro-static charges,^^ and for minimizing halation.^^
Important suggestions on the standardization of raw film dimensions were submitted by Lummerzheim^® at the Seventh International Congress of Photography, London, July, 1928. These were related to (1) pitch of perforation and shrinkage, (2) size and shape of perforation, (3) size of film, (4) staggered perforations, and (5) spooling of raw film and core dimensions. Progress has been made on the adoption of standards relating to 16 mm. film and data have been assembled on dimensional standards for film