American cinematographer (Jan-Dec 1924)

July, 1924 AMERICAN CINEMATOGRAPHER Nineteen ion that it is dependable. A tuning fork of 60 beats per second is employed to control the speed of the motors. The motor at the station that is transmitting holds all receiving station forks automatically in phase with the sending station fork. And this synchronism can be definitely ascertained by glancing at what appears to be a hand on a dial, although it is in reality a swiftly rotating member illuminated by a light rapidly turned on and off by radio signals sent out from the station which is transmitting at the time. With this apparatus we can automatically keep motors in synchronism which are separated hundreds, even thousands of miles. Perhaps I might add that we are about aready to put into actual useful service four machines, in four stations, each machine being both a sending and receiving instrument. Pictures and messages can thus be sent both ways at the same time; and either by ( 1 ) radio, by (2) directed radio, or by (3) wire. Light Failure Warning It may be of passing interest to note that as a sort of by-product of our work, apparatus has been developed which will give warning at headquarters when a distant lamp or lamps go out or otherwise fail for any reason, and identify the lamp. The costs of the apparatus is very low indeed. These warning devices are useful in railroad signal lamps; mail plane night-flying routes; and in marine lighthouse installations, some of which are in isolated locations visited but once a year perhaps. Good Definition T NCREASED speed at no sacri*■ fice in other optical qualities — that is what has been accomplished by Bausch & Lomb Ultra Rapid Anastigmat Lens, f:2.7. With nearly twice the speed of the f :3.5 lens, the f:2.7equals it in definition, and at the same time has the same degree of sharpness from center to margin. Circular H-u suggests hovj to solve the problem of poorly lighted interiors. Ask for a copy. Bausch fcf Lomb Optical Co. 228 Freeman St., Rochester, N. Y. Chicago London New York Boston San Francisco Washington CINE CAMERA TAKING 3200 PICTURES PER MINUTE (Continued from page 9) of the bird ; the wing bones are bent at right angles on the back-stroke, and are fully extended, that is, they are straight out from the body, on the forward-stroke ; and the movement of the feathers show a pressure at the tip of the wing far greater than was suspected, and probably accounts for the airplane accidents in which crashes have occurred because of the loss of an aileron. The quality of the negatives has now reached a point quite creditably comparable with the negatives which are intermittently moved at but a tenth to a twentieth the speed. I think the camera is destined to prove an instrument of great value in scientific and engineering investigations, and are now avaible for the purpose. Reggie Lyons, A. S. C, has annexed another foreign car to his string. What will the next one be, Reg? Jackson J. Rose, A. S. C, has finished photographing two Universal productions directed by Arthur Rosson. Robert Kurrle, A. S. C, is photographing Edwin Carewe's First National production, "Madonna of the Streets." Nazimova and Milton Sills lead the cast. TITLES ART BACK GROUNDS DEBRIE CAMERA And Equipment All for $500. ANDRE BARLATIER American Society of Cinematographers FOR RENT Two Bell and Howell Cameras, 40, 50, 75 mm. lenses, Thalhammer iris. Jean Trebaol, Jr., 7042 Stilson Street, Palms, Calif. Telephone 761-243.