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Author
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Topic: Lens Port Blower Thingy??
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Ken Layton
Phenomenal Film Handler
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Posts: 1452
From: Olympia, Wash. USA
Registered: Sep 1999
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posted 11-21-2000 03:29 PM
Barry:Please post a picture of them or email to me. If the motor is shot, I might be able to find one.
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David Kilderry
Master Film Handler
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Posts: 355
From: Melbourne Australia
Registered: Sep 1999
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posted 11-22-2000 04:26 AM
Barry,Drive-ins in some cases used blowers instead of port glasses to assist in delivering every last bit of light to the screen possible. When you consider most drive-ins could read less than 4 footlamberts, the loss made by a often dusty port was measurable. The blower was not to cool anything or keep heat in or out but soley to stop moths and insects from landing on the projection lens and keeping rain off the lens. I never understood why more drive-ins did not have blowers as you could clearly see the light loss when the port glass was placed in front of the lens (only our film projection ports had blowers, slide projection ports and observation ports were still glass. David
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Tim Reed
Better Projection Pays
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Posts: 5246
From: Northampton, PA
Registered: Sep 1999
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posted 11-24-2000 09:53 AM
quote: They were designed to keep bugs out of the booth
According to period literature (maybe it was in the DITMCO catlog, too), the idea was to keep dust off the front of the lenses (sorry, I can't site specific references presently, as all my materials are in storage). Seems to me, if they had been designed to keep bugs out, there should've been blowers on ALL the ports and doors... not just the projection ports. Whereas dust through these other inlets wouldn't have mattered as much, as far as the lens was concerned (although we all know it didn't make much difference anyway). I'd never heard the bug thing before, but I guess it would perform the same function. ![](http://www.film-tech.com/ubb/smile.gif) ------------------ Better Projection Pays!
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