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EXHIBITORS TRADE REVIEW Volume 10. Number 21.
PRO J ECTION
TENTATIVE PROGRAM OF S. M. P. E. AT BUFFALO MONDAY, OCTOBER 31, 1921 10.00 A.M. — Opening Exercises; President's Address; Minutes of Last Meeting; Unfinished Business; New Business; Election of Officers; Lunch. 2.00 P. M. — Report of Papers Committee: Paper and Discussion — "Comparison of Large and Small Condenser Systems," by Dr. W. E. Story, Jr. Paper and Discussion — "Optical Glass," by H. N. Ott. Trip to factory of Spencer Lens Company. 8.oo P. M. — Theatre Party.
TUESDAY, NOVEMBER 1, 1921 10.00 A. M. — Paper and Discussion — "A Point Source of Light," by C. A.
B. Halvorson. Paper and Discussion — "Industrial Mechanigraphs," by Harry Levey. Paper and Discussion — "Analysis of Motion," by Charles P. 'Watson. Paper and Discussion — "Taking Pictures at 1500 Exposures per Second," by
C. Francis Jenkins. Lunch. 2.30 P. M. — Trip to Niagara Falls.
WEDNESDAY, NOVEMBER 2, 1921
10.00 A. M. — Report of Committee on Electrical Devices; Report of Committee on Projection Machines; Report of Committee on Safety; Report of Committee on Auditing; Report of Committee on Optics; Report of Committee on Nomenclature; Report of Committee on Studios; Report of Committee on Education; Report of Committee on Publications; Report of Committee on Advertising; Report of Committee on Membership; Report of Committee on Cameras and Perforations; Report of Committee on Reciprocal Relations; Report of Committee on Progress; Report of Committee on Utility. Lunch. 2.00 P. M. — Paper and Discussion — "Effects of Studio Lights on the Eye," by L. A. Jones. Paper and Discussion — "Photometric Measurements to Determine the Lighting of a Motion Picture Studio," by Dr. W. E. Story, Jr.
7.30 P. M. — Banquet and Entertainment.
THURSDAY, NOVEMBER 3, 1921
10.00 A. M. — Paper and Discussion — "Standard Reel, the Need for Improvement as Regards Film Reels," by F. H. Richardson. Paper and Discussion— "Testing and Maintaining Photographic Quality of Cinematographic Emulsions," by Dr. A. B. Hitchins. Paper and Discussion — "The High Intensity Arc Lamp," by A. D. Cameron.
open circuit voltage of approximately 180 volts, which drops to 60 volts when one lamp is burning. The two lamps are connected in series with the generator without any steadying resistance whatever. Short circuiting switches are provided to close the circuit around the lamp that is not in use, and since these are connected ahead of the lamp, disconnecting switches allow the arc to be trimmed without opening the circuit. When the second arc is struck, the machine automatically increases its voltage until there is a terminal voltage of approximately 120 volts when both lamps are burning. The machine voltage accommodates itself to the length of arc drawn, so that it will give practically the same current from one very short arc, to two long arcs in series. This results in a very simple scheme of wiring; since the panel containing the field rheostats and instruments can be placed in any convenient part of the booth, while the two individual short circuiting switches can be mounted equally conveniently on the stand of the picture machine. The very flexible source of current behind the lamps tends to keep the arc quiet, and at the same intensity which allows the picture to be faded in and out without any change of the light on the screen. The efficiency is very mUch better than can be secured from any rotary converter or motor generator set requiring a steadying resistance in the circuit, and the design is such that the current in the arc can be (Continued on page 1473)
THEATRE PROBLEMS
Owners and managers of Motion Picture Theatres are invited to send in their problems to this department. They will be answered ivithout charge
The G-E Compensarc
Will you please describe for my benefit and that of several others I have talked with the difference between the new G-E Compensarc and former makes.
T. E. Clarke,
Seattle, Wash.
The new motor generator of the General Electric Company compensarc differs materially from the former type in that the lamps operate in series instead of in multiple when changing the pictures. It has been developed for two reasons, to improve the overall efficiency when operating two lamps and to produce a machine which is more easily handled by an inexperienced operator, particularly on two lamp operation.
The motor generators are built with special generators and standard induction motors. These are mounted on a cast iron subbase, and connected by a rigid coupling, forming a three bearing set. The nameplate rating of these sets indicates the dropping characteristics of the generatoi voltage.
The machines are designed to give ar
The G-E compensarc
Ten Thousand Dollars Reward
will be paid to any person who can prove that B. F. Porter did not sell and install Simplex Machines in the Capitol Theatre at 51st Street and Broadway, New York City.
B. F. PORTER, 729 7th Ave., New York