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Jan., 1932] ABSTRACTS 121
should preferably be dark and the letters light. The type must be simple, clear, and attractive. The optimum length for the title has been investigated from a consideration of (1) length of the lines, and (2) number of letters. A useful table is given showing length of the lines, number of letters, length of the title, and length of the film per line of title, assuming projection at the rate of 24 frames per second. L. E. M.
Motion Picture of the Eclipse of the Moon. F. Albrecht. Filmtechnik, 7, May 2, 1931, p. 1. On April 2, 1931, the first motion picture of a total eclipse of the moon was photographed at the Trepton observatory hi Germany. With the usual motion picture camera the image of the moon is far too small and even with a teleobjective of 30 cm. The image is only 3 mm. in diameter. In the successful motion picture an //10 objective of 65 cm. focal length was used, mounted on an Ernemann E camera. The camera and lens were secured in place on the 21-meter Trepton telescope. Positive film was employed and exposures of l/4 to Vz second were made, using a blue filter with the teleobjective operated with a 35-mm. opening. The camera shutter opening was increased to 160 degrees at the beginning of the eclipse and decreased to 90 degrees as the eclipse passed. Single frame exposures were made at intervals of 5 seconds, thus giving for the 3!A hour time a length of film which, when projected at the rate of 24 frames per second, occupied P/2 minutes. L. E. M.
Television Demonstration at Broadway Theater. Film Daily, 57, October 23, 1931, p. 1. A television demonstration was given at the Broadway Theater, New York, for two weeks beginning on Oct. 22, 1931, a 10 by 10 foot screen being used. The receiving disk revolved 900 times per minute and a projection system projected the images on the screen. The sending station was located a short distance away in the Theater Guild Studio. G. E. M.
BOARD OF ABSTRACTORS
CARRIGAN, J. B. MACFARLANE, J. W.
COOK, A. A. MACNAIR, W. A.
CRABTREE, J. I. MATTHEWS, G. E.
FOWELL, F. McNicoL, D.
HAAKE, A. H. MEULENDYKE, C. E.
HARDY, A. C. MUEHLER, L. E.
HERRIOT, W. PARKER, H.
IRBY, F. S. SANDVICK, O.
IVES, C. E. SCHWINGEL, C. H.
KURLANDER, J. H. SEYMOUR, M. W.
LOVELAND, R. P. WEYERTS, W.