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The Strong ZIPPER Changeover
Made by a Projectionist for Projectionists!
Offering Exclusive Patented Features Adaptable to All Makes of Projectors
£**
-SPEED CONTROL
ELECTRIC CHANGEOVER
ESSANNAV ELECTRIC MFG. CD.
KNOB FOR LIFTING FIRE SHUTTER FOR -^
FRAMING
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^T SLOTS FOR-^ MOUNTING
p-POLARIZED PLUG CONNECTION
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FIRE SHUTTER TRIGGER
FLEXIBLE "
STEEL
SHAFT
DOWSER
THE ZIPPER CHANGEOVER IS AS MODERN AS TOMORROW
ZIPPER Changeovers for all models mount directly on the projector at the aperture and can be installed within 10 minutes without any drilling or tapping, etc., and require no brackets! A new-type treadle foot-switch, utilizing an unbreakable mercury switch, eliminates all switch trouble. Weighs only 20 ounces; guaranteed against trouble for one year after purchase.
The combination Sound-Vision
Changeover is now available in all ZIPPER models for use with any RCA sound installation. This method of changeover is EXCLUSIVE with the STRONG ZIPPER, being fully covered under U. S. Patent No. 1,796,970. These combination models for RCA systems are priced at $125 per pair, including foot-switches.
• • •
Strong ZIPPER Changeovers are especially designed and fitted for the following mechanisms:
SIMPLEX PROJECTORS The New E-7 The Super-Simplex Standard Rear Shutter Standard Front Shutter With B. & S. Rear Shutter
With Wenzel Rear Shutter
• • •
MOTIOGRAPH PROJECTORS
All Models
• • •
KAPLAN PROJECTORS
CHANGEOVER SOUND AND PICTURE SIMULTANEOUSLY !
Exclusive Patented Feature
Zipper Changeovers are available equipped with a sound switch so that sound and picture can be changed over simultaneously by merely stepping on the foot-switch. When so equipped, an auxiliary switch is provided for disconnecting the automatic changeover, so that the sound can be run off on one projector while the picture continues on the other.
Only Strong Offers This Feature
PRICE ON ALL MODELS: $60 per pair
With Treadle Mercury Switches: $75
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ESSANNAY ELECTRIC
MANUFACTURING CO.
L. D. STRONG, President Makers of Electric Changeovers for 20 Years
908 So. Wabash Ave. Chicago. 111.. U. S. A.
INTERNATIQNAl PROJECTIONIST