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244 PROGRESS REPORT [j. s. M. P. E.
commercial interest have occurred recently. Friedel has described Von Mihaly's system in some detail and it is claimed that synchronization has been simplified further.198
Public demonstrations of television have been made in South Africa by the Baird Television Development, Ltd. The apparatus used is similar to that recently placed in operation in Germany with which sound and vision are broadcast simultaneously on two wavelengths.199 The Australian Broadcasting Company expected to commence broadcasting pictures from station 2FC in Sydney by the latter part of August, 1929, using the Fultograph process.200
In a television long distance test, the voice and face of D. W. Griffith were transmitted from Schenectady, N. Y. to Los Angeles, Calif.201 The voice of Gloria Swanson was recorded on an RCA Photophone equipment after having been broadcast by short wave over 3000 miles from London to New York.20ia
A Luxemberg scientist living near Paris has recently completed an intricate, but apparently practical, device for the transmission of moving pictures by wireless.202 Kuchenmeister 203 has patented the use of the discharge from a crystal oscillator as a light source in a television apparatus.
D. General Recording.
Time-lapse cameras have been used by the U. S. Coast Survey for recording readings on a number of instruments measuring the velocity of water currents in Chesapeake Bay.204 Mather has produced a series of geology films for use at Harvard University.205 The U. S. Department of Agriculture has made a film study of an abandoned concrete bridge until cracks formed.206
A high speed camera capable of making 8000 to 16,000 pictures per second has been described by Beck.207 The film is wrapped around the periphery of a motor driven drum and is exposed with the aid of a lens and 45 degree mirror. It is recommended for studying the movement of electric discharges. The same author has described a camera for photographing the interior of tubes, rifle barrels, and similar surfaces, a linear record being obtained.208 The use of the motion picture camera for studying the duration and brightness of ignited flash powders is discussed by Maiser and Umbehr.209 Electric welding has also been studied by means of a cine camera designed to make four narrow pictures across each average frame of 35 mm. film.210 The Imperial College of Science (London) is making a