Radio age (Jan 1927-Jan 1928)

RADIO AGE for April, 1927 43 Talking Movies Now] Practical Scheme TALKING motion pictures in which the simultaneous timing of action and sound is all times assured have been announced and demonstrated by the General Electric Company. The process, the result of several years of experimenting in the General Engineering Laboratory of the company, means but slight change in standard motion picture projectors, since it involves only the addition of a sound-reproducing attachment and a loud speaker suitable for auditorium use. Both the picture and the sound are recorded on the same film. One of the demonstrations has been with music to accompany feature films, the music being by a full concert orchestra. Development of this field requires no change in the technique of making the original film. After the original picture film has been made and titled, the accompanying music is played by a concert orchestra and is recorded on a film. The picture and sound records are then printed on one film in the proper time relation. Another type has been the showing of singers and instrumentalists while they are presenting programs. Thus, when an orchestra is shown on the screen, it is possible to follow the playing of each musician, and see his actions on the screen and hear him. Even cymbals — among the most difficult to reproduce faithfully — sound like cymbals. Similar demonstrations have been made with vocal and instrumental soloists, with string and with vocal quartets, and with speakers. To the casual observer the talking film does not differ from the usual motion picture positive. It is of standard width, but along the left margin there is a strip a small fraction of an inch wide on which is a series of horizontal light and dark bands and lines, of varying widths and intensities. It is this series of bands and lines, which produces the sound. The film is passed through the reproducer at constant speed, and, as these light and dark bands pass rapidly before a tiny slit in an optical system, the amount of light is varied, le ever-changing amount of light ceived by a photoelectric cell — lectric eye — which is extremely ive to any change in the amount ght striking it. Please Protection When your radio antenna is installed care should be exercised to make sure that the aerial system is s protected from lightning. 'H| The Jewell lightning arrester is Bs ideal for lightning protection. It meets the standard requirements for lightning arresters as set forth by Underwriters Laboratories, and is listed by that organization. It is compact and easily connected. The construction is substantial and it may be installed either indoors or outdoors. Jewell Lightning Arrester Ask your dealer to show you one or write us for descriptive circular No. 1019 Jewell Electrical Instrument Co. 1650 Walnut St., Chicago "27 Years Making Good Instrument*" We Carry a Complete Line of Parts for the Following Circuits: Worlds Record Super Eight Madison Moore One Spot Nine in Line Unicontrole Melo-Heald Eleven Tubes St. James Super Clough Super Victoreen Super Nine in Line H. F. L. Aerodyne Karas Equamatic Carborundum Super Silver-Marshall Sampson T. C. Aero Short Wave Sargeant's Infradyne Nakken Ultra Five Phasatrol Sampson Radio Frequency Choke Coil Chicago Daily News Receiver Worlds Record Super 9 In writing us SPECIFY just what hook-up you are interested in WHOLESALE RETAIL s/l/otfiinyi tout Y£a<fzcr WM 226 WEST MADISON STREET A. ■K^^fe TELEPHONE, ^^^^^flPfe Hit MAIN 4627 1 IV CHICAGO ILLINOIS Mention Radio Age When Writing to Advertisers.