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ABSTRACTS
A Meaningless Jubilee. G. SEEBER AND K. WOLTER. Filmtechnik, 6, November 15, 1930, pp. 1-4. The suggestion of a celebration for the Skladanowsky brothers prompts an editorial chronological review of the beginnings of motion pictures in the various countries. The article points out the fallacy of any claims that the Skladanowsky brothers gave the first public showing of motion pictures. The date of their showing in Berlin was November 1, 1895, long after the public exhibitions of Edison, Jenkins, Paul, the Lumiere brothers, and Acres. L. E. M.
Damage to Sound Films in Projection. A. SZEKELY. Filmtechnik, 6, December 13, 1930, pp. 9-10. The suggestion is made that the projection life of sound films is low because of drying out during the time that the films are threaded in the projectors and exposed to temperatures of 35 °C. to 40 °C. Such troubles may be minimized by using larger sprockets and better idler devices for keeping the film on the sprockets. L. E. M.
Sound Film's Production Cost Near Ten Times That of Silent. Ex. HeraldWorld, 101, December 27, 1930, p. 7. According to a preliminary report of the U. S. Census Bureau, more than 1000 sound films were produced in 1929 at a total production cost of $100,000,000, while 1500 silent pictures were turned out costing less than $17,000,000. There were 143 establishments included in the census and their total expenditure was over $180,000,000, compared with $134,000,000 for 142 concerns reported in 1927. Negative films used in 1929 cost $125,000,000 and positive films over $10,000,000. G. E. M.
Comparative Investigation of Electric Pick-Ups. P. HATSCHEK. Filmtechnik, 6, December 13, 1930, pp. 12-14. Pick-ups of German manufacture were tested for response characteristics. Curves are given which show their behavior over a frequency range of 60 to 5000 cycles per second. L. E. M.
Metal Film for Motion Pictures. Film Daily, 55, January 14, 1931, p. 8. Metal film, claimed to be more durable and resistant than the present celluloid preparations, is reported to have been invented by L. Lumiere. C. H. S.
Distortion of a Variable Density Modulation in Printing the Positive. LEENHARDT. Tech. Cinemat., 1, November-December, 1930, p 11. The negative sound record produced in the variable density method of sound recording has a logarithmic distortion, on account of which no accurate appraisal of recorded sound quality is possible by direct reproduction of the negative. A corresponding distortion in the process of printing the positive compensates for it. Mathematical and graphical demonstration is given for an originally pure sinusoidal sound wave. C. E. I.
Yield of the Fixing Bath in a Machine. R. LANDAU. Tech. Cinemat., 1, November-December, 1930, p. 8. In a tube type of developing machine the utmost yield of useful work is obtained from the fixing bath by a system of
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