Dave, Buy any of the later Oscilloscope cameras that show up on ebay and you'll find photo transisters. Usually 2 in each. C59 rings a bell. I hope this is correct. They were part of the more complex cameras light measuring system for exposure. The older and simpler ones don't have them.
I found a quick way to do a shutter test when I got impatient one weekend after rebuilding the rear shutter of my Graflex.
A TV set, a dark room, and a polaroid back can give you an idea of how your shutter is firing.
Turn the contrast on the TV to max, and take a close, sharp-focused shot of some part of the screen using the polaroid back. Take a loupe to the picture and count the number of scan lines that appear. Then multiply this by the scan time (77microsec/line?) to find out how long the shutter was open. If you are using a travelling-slit shutter, make sure the axis of the slit is running across vertically.
Good luck, Tox
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