International photographer (Feb-Dec 1929)

Sixteen The INTERNATIONAL PHOTOGRAPHER October, 1929 ^Radio movies BY R. N. McCULLOUCJH, Super-visor of Projection and Electrical Equipment, West Coast Theatres How soon can we have direct vision of the world's activities. Will Radiomovies be the coming entertainment? We are able to hear speech and music, and sight can be carried just as well. Never has any invention had so much anticipating publicity, before its successful attainment, as Television. Radiovision is based on one of the simplest mysteries of our childhood, when someone would draw parallel lines across a paper under which there was a penny, and an Indian would appear. This is the same process used in Radiovision — instead of using a pencil, the lines are drawn with a point of light, which sweeps across the picture in successive parallel lines. Each picture frame is covered every fifteenth of a second and the persistence of vision builds up the image directly on the eye. At the present time, the fundamentals of all systems are the same. There are two methods employed — the disc scanner and the drum scanner. The disc receiver is the simpler mechanism. Both devices scan the picture in the same manner. They build up a picture line by line, from left to right with line distribution from top to bottom. The Radiovision Moving Picture Frame is made up of forty-eight lines for quality detail, and fifteen picture frames per second to obtain smooth continuity. The disc receiver is made up of three parts — a neon lamp — scanning disc — and a motor to rotate it. The scanning disc is twelve inches in diameter. Thin material is used for the disc such as tin, brass, aluminum and cardboard (blacked). The circle is divided into forty-eight equal spaces. However, forty-eight holes are not accepted as standard. The scanning holes are 1/32 inch in diameter. The first hole is 1/4 inch from edge of discs and spirals to 3/4 of an inch at the end of the spiral. The Neon Lamp is installed close behind the disc near the top. A 1/20 horse-power motor is used at the present time to drive the disc. The scanning disc speed is 900 revolutions per minute. Synchronism is attained by changing the speed of the scanning disc. Most installations have friction discs on the motor shafts, which bear against the scanning disc, and by moving the motor back and forward the speed of the scanning disc is increased or decreased. The Radio output is connected to the Neon Lamp. The lamp requires about 300 volts. The glowing electrode (cathode) faces the disc. The picture appears by looking at the Neon Lamp through the Hying holes of the scanning disc. If the picture is upside down, the scanning disc is reversed by reversing the motor, or changing the disc to other side. A radio receiver, which will bring in good phone reception is good for Radiovision. Further development will permit greater refinement as to the present Radiovision equipment. Radiomovies will be the next new development in entertainment. They are practical now, but only on a very small scale. The future will bring us to the point where we will be able to see national sports and other great events exactly when they take place. The theatres will be equipped with a screen and receiving equipment. The receiving equipment will replace the present projection room equipment. The present development of the short wave, high-frequency radio communication, is due to the American amateur. Will the American amateur develop Television and Radiovision to a satisfactory point of operation? o Brother Will E. Hudson, staff cameraman of Pathe News, with headquarters in Seattle, was a visitor at headquarters of Local 659, recently. Brother Hudson is one of the most interesting cameramen in the profession and has had a wide and varied experience. Especially is he informed as to Alaska and China and stories on these subjects by Mr. Hudson will appear in The International Photographer. Bell and Howell Camera Bargain 170 Shutter, 3 3.5 Zeiss lenses, Matt Box, Large Mitchell Finder, Mitchell Tripod and head. $800.00 cash. IRA B. HOKE 1312 N. Detroit, Hollywood, Cal. Designers of Tools and Dies Models Developed Barsam Tollar Mechanical Works CINEMA MANUFACTURERS 7239 Santa Monica Blvd. Hollywood, California Phone GRanite 9707 FOR RENT Mitchell and Bell & Howell cameras equipped for sound Perfect Condition Call GLadstone 4111, Station 250 or Lloyd Knechtel HO-7780 OX-1593 You Can "Double In" OUTDOOR ACTION BACKGROUNDS behind any intimate Dialogue shot on the sound stage, by using a DUNNING PROCESS PLATE DUNNING PROCESS COMPANY 1616 Cahuenga Avenue Phone GLadstone 3959 for demonstration