Journal of the Society of Motion Picture Engineers (1930-1949)

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232 PROGRESS REPORT [j. s. M. P. K. previously mentioned, but does make it possible to do the recording in acoustically proper rooms without confusion of lights and camera, and in the photography makes it possible to proceed in the usual way as regards lights, angles, cameras, spoken instructions from director, etc. The method in brief, is to do the sound recording first and then to do the photography interlocking the cameras with the play-back device. There promises to be an expanding use of this method particularly in musical numbers. In the more usual methods of sound recording, advances have been made in obtaining acoustical perspective exactly analogous to methods of lighting which avoid flatness and suggest visual perspective. The methods which give this desirable result, also give some simplification in the necessary mixer control (only one microphone is considered necessary in a set as large as 15 feet by 30 feet) and allow the set designers to use a greater range of materials since it is no longer necessary to make all sets of sound absorbing materials. Hemardinguer73 has treated the subject of manufacturing and registering of phonograph disks. Improvements in methods of rotating the wax disks have been effected according to Elmer.74 Hatschek75 has discussed the characteristics of photo-electric cells and with Lihotzky76 has treated the subject of the optics of sound film processes. Theory underlying the physical basis of sound films has been treated in a series of papers by Klages77 and others, covering such subjects as electrons and their properties, the action of electrons in a high vacuum, etc. A review of the acoustical problems in conjunction with sound recording and reproduction has been made by Hatschek.78 Paris79 has deduced a formula for calculating the reverberation coefficient of absorption of a material if the coefficient of plane waves is known for all angles between 0 and 90 degrees. In general, the reverberation coefficient differs from the coefficient at normal incidence. Data of this nature are valuable in determining the construction materials for "live" sets according to Maxfield,80 thus giving the actors greater freedom of action. A ten weeks' course giving instructions on sound, the theory of sound recording and reproduction with explanations of recent developments is being offered this fall to 250 students by the Academy of Motion Picture Arts and Sciences.81 Humphrey82 treated the subject of sound studio recording installa