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Why
Faulty Changeovers?
(From "Some Current Changeover Practices," I. P. for May, 1941.)
AN OLD-TIME projectionist friend of ours . . . tells us that he has had no less than four aperture fires in one day because of tin foil cemented onto film to operate homemade reel alarms. The foil, placed along the inner side of the film, not the soundtrack side, scrapes off at the intermittent sprocket, our friend says, pushing the shoe back'." The whole strain of moving the film, therefore, falls on the sprocket holes at the sound-track side. These tear. The film stops moving, and catches fire.
. . . Such prints go through the exchanges with foil cemented to them, and the exchanges do not remove it . . .
Reel-end alarms of either the contact or the centrifugal type might ... be given more consideration than they have had to date, particularly by those managers who consider a poor changeover an unpardonable crime . . .
MOVE ARM TO LEFT TO LENGTHEN ALARM PERIOD. MOVE ARM TO RIGHT TO SHORTEN ALARM PERIOD.
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1
STRONG REEL-END SIGNAL IS
A dj u s table
for Either 4 or 5-inch Hubs PRICE: $8.50 each
The Strong Reel-End Signal Offers Positive Protection
This device does not touch either the reel or the film. It is strictly mechanical and requires no batteries, no transformers, no governors, and no pre-setting by the projectionist.
It is not dependent upon any change in the normal, smooth operation of the projector.
It is installed within 5 minutes, requiring no drilling. Once installed — forget it, as has been demonstrated conclusively by more than 1200 installations in theatres throughout the United States.
About one minute before the end of the reel the STRONG REEL-END SIGNAL begins to ring, continuing distinctly for 15 seconds — then it stops. The duration of the bell-signal can be increased or decreased by simply moving the arm to either the right or the left (see illustration). Here is a device that will end permanently all your changeover troubles. Simply yet sturdily constructed, the STRONG REEL-END SIGNAL has given complete satisfaction in hundreds of theatres where it is installed.
STRONG also manufactures the famous ZIPPER CHANGEOVER with treadle mercury switches in a variety of models suitable for all American-made projectors, including Simplex, Brenkert, Motiograph and Kaplan mechanisms. This unit weighs only 20 ounces and is guaranteed against trouble for one year after purchase. STRONG CHANGEOVERS have led the field for 25 years.
ESSANNAY ELECTRIC MANUFACTURING CO.
Makers of Precision Projection Equipment for 25 Years
1241 South Wabash Avenue Chicago, Illinois, U. S. "A.
PRINTED IN U. S. A.