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necessitating no unusual or complicated wiring.
While it is expected that development work will continue, the unit described is a frozen design and is in production. In conclusion, we have presented herewith the present stage of commercial availability of a simple, low-cost, instantaneous theater television projection system.
Discussion
Robert E. Lewis (Armour Research Foundation) : How many lumens do you get out of the system?
Frank H. Riffle (Motiograph, Inc.) : (Mr. Riffle read the paper.) The only actual measurement that we have made is at the corrector plate and it is about 160 footcandles.
Chauncey L. Greene (RKO Orpheum Theater, Minneapolis): Perhaps I am again trying to take in too much territory here, but I would like to see if we can't translate those figures somehow into a screen brightness. Did I understand you that 160 footcandles of brightness, so to speak, of the face of the tube.. .?
Mr. Riffle: No, that was at the corrector plate.
Mr. Greene: Now, is there any way of arriving at an approximate ratio between that and the screen brightness for any given picture size, that is, could we, for instance, divide that area into the screen area and apply a factor of loss?
Mr. Riffle: Yes — and in calculating this, we find approximately 0.4 foot-candles of light at the screen, which may appear to be comparatively small; but the brightness of the picture observed is entirely satisfactory.
trical wiring diagram.
BOOTH WIRING
CONTROL BOX TO BE LOCATED NEAR POR* HOLE FOR EASY MANIPULATION OF CONTROLS BJ OBSERVATION.
NOTE
(21 5-PRONO SOCKETS a PLATE SUPPLIED BY TRAD.
PROJECTOR WIRING
A.C. TO PROJECTOR "t
Trad and Muniz: Theater Television System
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