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ABSTRACTS 451
a high output therefore less amplification is required than is usual. Two cells are mounted so that a replacement can be readily made hi case one cell ceases to function. C. M. T.
Light Sensitive Cells. JOHN P. ARNOLD. Projection Eng., 1, September, 1929, p. 44. The properties of photo-conductive, photo-electric, and photovoltaic cells are briefly described. C. M. T.
Ufa Sound Studios. An Original Lay-Out. Kinemat. Weekly, 152, Oct. 24, 1929, p. 30. Four Ufa studios at Neubabelsberg were completed a few weeks ago. These studios are built about a central portion where all the recording apparatus and monitors are placed. C. M. T.
New Findings in Sound Theater Acoustics. Ex. Herald World, 97, Sect. 2, Nov. 23, 1929, p. 30. A summary of observations made in about five hundred theaters is given. Conclusions reached are: that the previously accepted reverberation time value should be corrected, that square theaters are better acoustically than narrow theaters, and that seats should be made to absorb the same amount of sound whether occupied or not. C. M. T.
New Sound Film Process. G. SEEBER. Phot. Ind., 27, April 3, 1929, p. 389. In this modification of the Poulsen magnetized wire memograph, the film base itself is made magnetic by the incorporation of colloidal particles of a magnetic alloy — cobalt, nickel, and iron. C. M. T.
Amplifiers and Hookups to Minimize Distortion. P. HATSCHEK. Filmtechnik, 5, Aug. 3, 1929, pp. 353-9. The principles of vacuum tube amplification, distortion, general characteristics of resistance coupled and transformer hookups, and explanation of push-pull amplification are given. — Kodak Abstr. Bull.
Make-Up Tests by the American Society of Cinematographers. Amer. Cinemat., 10, November, 1929, p. 13. Tests to determine the best make-up for panchromatic film and for color photography have been conducted at the TecArt studios under the auspices of the American Society of Cinematographers. It is reported that a new series of paints and greases have been found which photograph as they appear to the eye. The results will be embodied in a quick reference make-up chart. C. M. T.
Lighting "Rio Rita." Internal. Phot., September, 1929, p. 12. A total incandescent wattage of 976,000 was used during the eight days of filming the color sequences of "Rio Rita." C. M. T.
The Schiifftan Process of Model Photography. HANS NIETER. Phot. J., January, 1930, p. 16. A method of combining actual photography and model photography to create the illusion of immense settings upon the screen. This method uses a mirror of special silvered glass set at an angle to, and near the lens of the camera. A model of the set is constructed. The necessary parts of this set are built upon the studio floor. The mirror is scratched away to allow this portion to be seen by the lens through the clear glass, the rest of the mirror reflecting to the lens the image of the model which matches perfectly with the parts of the set built on the stage. G. L. C.
Pan Film. Camera Craft, 36, November, 1929, p. 526. The use of panchromatic film has made it necessary for the lens designer to correct his objectives for all colors. C. M. T.
New Depth Process for Motion Pictures. Mot. Pict. Projectionist, 2, September, 1929, p. 37. The appearance of depth in a picture is obtained by photo