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Graflex "Speed - I - O - Scope"

 
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disemjg



Joined: 10 Jan 2002
Posts: 469
Location: Washington, DC

PostPosted: Tue Apr 28, 2009 2:12 am    Post subject: Graflex "Speed - I - O - Scope" Reply with quote

I just got this oddball device, which is an Ilex shutter with no optical elements, just a flat piece of glass at the front to keep your fingers out of the shutter. The back of the shutter is fitted with a large tube and a clamping screw, evidently to slide over some projection lens.

What was this for? My best guess is for some form of flash training, where an image was projected for a moment and you were supposed to be able to identify what the image had been. Something like aircraft identification training.

I'll ask Les to post some photos.
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glennfromwy



Joined: 29 Nov 2001
Posts: 903
Location: S.W. Wyoming

PostPosted: Tue Apr 28, 2009 4:00 am    Post subject: Reply with quote

My understanding is these things were used during the war to train pilots to instantly recognize enemy aircraft. It was placed on the lens of a slide or film strip projector.
I guess if you saw the thing flash a picture enough times, the images would stick to your brain. I have one I was using as a front mounted shutter but it's worn out and I don't think I can fix it any more.
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Glenn

"Wyoming - Where everybody is somebody else's weirdo"
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Dan Fromm



Joined: 14 May 2001
Posts: 1891
Location: New Jersey

PostPosted: Tue Apr 28, 2009 9:54 am    Post subject: Reply with quote

When I was in high school I took a speed reading course that used a device called a tachistoscope to project letters, words, and short sentences for a very short period of time. It was basically a film strip projector (remember them?) with a shutter in front of its lens. This is basically Glenn's application.
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