Before the advent of 60+ FPS video cameras and instant replays, how did races make sure they got the photo at the moment the runner/car/horse crossed the finish line in case of a photo finish?
In: Engineering
The film was a long strip, not individual frames. The entire strip was dragged across the aperture, which was a slit positioned exactly on the finish line. When you develop it, it will show the finish line and anything that crosses it. Right to left you can see what crossed first. Anything not moving will be a streak, but anything that crosses the slit will show up as the object at the point where it crossed the line albeit slightly distorted.
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