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798 Transactions of S.M.P.E., Vol XI, No. 32, 1927
pressure pads exert the same amount of tension on the film at all times. In addition to the old gate having been discarded, the old type lower fire guard or shield has also been eUminated, and in its place is a film guard of much more satisfactory design and so constructed that instead of opening laterally it drops vertically entirely out of the way so as to leave the mechanism free from obstructions while threading the film. This guard when in its normal operating position is locked securely in place by means of a gravity operating lock so placed that when it becomes necessary for the projectionist to lower the film shield his finger automatically comes in contact with the latch, readily Hfting it from the latch bar.
The lettered parts in Fig. 4 are described below:
A. Lateral guide roller.
B. Upper and lower film pads. These pads are of hardened steel, ground, highly pohshed and beveled and so held under tension as to assure a square contact with the film at all times. They are maintained under sufficient tension to insure perfectly steady projection and no adjustment is necessary.
C. Film plate pad to which is attached the upper and lower film pads together with the central film pad and their respective tension springs.
D. Gate lock screw.
E. Fire shutter lift lever. A newly designed link between the fire shutter governor and the fire shutter proper.
F. Central film pads. These pads are maintained under fighter pressure than 5, and their sole function is to keep the film in focus over the aperture. These pads, like the upper and lower film pads, are of hardened steel, ground and highly poKshed.
G. Rear baffle plate. This plate is rigidly attached to the front or support plate and carries the lateral guide roller, upper film shield gate latch, insulated trip lever, gate stop, and film pad plate assembly.
H. Air space between G and /.
7. Air space between G and C.
/. Front plate (radiating and insulating heat shield). This plate is designed to eliminate warpage under severe heat.
K. Upper heat insulating cap.
L. Insulated gate latch lever.
M. Light shield to protect the projectionist's ej^es from the intense spot on the aperture.
N. Fire shutter pivot pin.
0. Lower heat insulating cap.
P. Lower loop protector. — This newly designed assembly is self -locking and is so constructed that it opens downward rather than laterally as in the former design.
DISCUSSION
Mr. Ktjnzmann: I should like to ask in the absence of Mr. Griffin whether the new accessories are adaptable to all models of Powers projectors. Mr. McGuire: They are.