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ABSTRACTS
The Editorial Office will welcome contributions of abstracts and book reviews from members and subscribers. The customary practice of initialing abstracts will be followed.
Contributors to the abstract section of this issue are as follows: G. L. Chanier, Clifton Tuttle, and the Monthly Abstract Bulletin of the Kodak Research Laboratories.
Solving the "Ice Box" Problem. W. STULL. Amer. CinemaL, 10, September, 1929, p. 7. An account of the various methods which have been used to silence the motion picture camera. Present-day practice attempts to stop the noise as near the camera as possible. Various types of sound absorbing casings for the camera are replacing the old type of sound booth. C. M. T.
New Portable Model RCA Photophone. H. L. DANSON. Ex. Herald World, 97, Sect. 2, Oct. 26, 1929, p. 58. The entire projector and sound reproducer system is housed in an all metal cabinet 24 inches square and 12 inches wide, mounted on four adjustable telescopic legs. The amplifier is housed in a separate metal cabinet of similar size. Volume control permits adjustment in graded steps from zero to maximum volume. -Accommodation is made in the amplifier for a second projector to permit smooth change-over. The speaker is an electrodynamic moving coil cone type. Film speed is standardized at 90 feet per minute and the projector operates/ from a power source of 110 volts, 60 cycles a. c. Recording facilities are offered by the RCA Photophone at its Grammercy Studios in New York.— Kodak Abstr. Bull.
Sound on a Wire. Stille Electromagnetic System Reviewed. Bioscope (Mod. Cinema Technique), 81, Oct. 16, 1929, p. vii. A steel wire or band is run between the poles of an electro-magnet, which is connected in the ordinary way to a microphone. The variations in the current density produced in the microphone are impressed electromagnetically on the traveling ribbon or wire. By passing the magnetized wire at a correct constant speed between the poles of the solenoid again, variations are produced in the magnetic field corresponding to those which were impressed on the wire. These variations may be amplified to give sound reproduction. The record is permanent under ordinary conditions, but may be completely removed by passing the wire or tape through an electromagnetic field of constant intensity. C. M. T.
Acoustimeter. R. F. NORRIS. Projection Eng., 1, September, 1929, p. 43. The output from a four stage transformer coupled amplifier is measured with a thermo-junction meter calibrated to read sound intensity. A Baldwin type magnetophone is used as the pickup. C. M. T.
Burt Reproducer for Talking Motion Pictures. Projection Eng., 1, September, 1929, p. 50. This reproducer, manufactured by the R. C. Burt Scientific Laboratories, is stated to have several advantages over other types. A synchronous motor drive without flexible drive shafts or universal points is ysed. The cell has