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20
INTERNATIONAL PROJECTIONIST
July 1934
SUPER INTENSITY
AUTOMATIC PROJECTION LAMP
H. C. 10
Super Intensity Lamp
The
Lamp With Accurate Arc Regulation
and Arc Focusing by Means of
the Heat From the Arc Itself
H. C. 10 Features:
• Self-Starting • Self-Focusing
• Independent Negative Feed Regulation
• Magnetic Stabilization • Better Arc
• Self-Lubricating Bearings
• Standard Ammeter • Carbon Indicator
• Forced Air Cooling • Correctly Shaped Hood
• No Feed Rollers • Full 22-inch Trim
Descriptive booklet on request. Write for it to
HALL & CONNOLLY, Inc.
Mechanism of Seeing Is Discussed by Luckiesh
WHILE brightness influences the certainty of seeing, it must be increased tenfold to increase certainty of seeing from threshold to 100 per cent certainty, says Dr. Matthew Luckiesh in his new 200-page book, Seeing and Human Welfare (Williams & Wilkins Co., Baltimore, $2.50). Dr. Luckiesh is director of the General Electric Lighting Research Lab. at Nela Park, Cleveland.
'Seeing Time'
Concerning the importance of the time factor in seeing Dr. Luckiesh says: "Everyone must be conscious of the fact that it takes time to see. The rate of growth and decay of sensations can be measured. Likewise, the human seeingmachine requires time to react and reaction-times are involved in seeing. Motion pictures are made possible by the persistence of vision. Also it is generally conceded that we do not see when the eyes are in rapid motion. This is a fortunate development, because it eliminates the blurring of objects as the focus of the eyes moves from one place to another in the visual field.
"If only when the eyes are at rest, the stopping time of the eyes is important. The average stopping-time of the eye is 0.17 second. In extensive tests of this it was found that the briefest interval of time that it is possible for an observer to fixate an object in order to gain an adequate visual impression varies for the most part from 0.07 to 0.30 second. Average is 0.17 second.
Time and Intensity
"The period of time available for seeing has considerable influence upon the threshold values of other factors. A critical detail of a size just visible when it is exposed to view for 0.3 second becomes invisible when the time is decreased. If an object of 50 per cent contrast can just be seen under a certain intensity of illumination when the time available is 0.3 second, the intensity of illumination must be trebled if it is to be visible when the time is reduced to 0.07 second."
24 Vandam St.
New York, N. Y.
NRA Names Committee to Fix N. Y. City Scale
A committee of five has been named by Division Administrator Rosenblatt to set a wage scale for New York City, members of which are: Charles Moscowitz, Loew's; Major Thompson, R-K-O; Harry Brandt, Independent Theatre Owners; Charles O'Reilly, Theatre Owners Chamber of Commerce; Joseph Blatt, Empire Union, and George Browne, I. A. T. S. E. president.
Close observers opine that this committee, constituting a radical departure from the announced intention of the NRA to name an "impartial arbitrator", could have been named seven months ago and saved thousands of dollars in expense and much trouble.