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The official timekeeping device is a photo as opposed to a clock. The athletes' times are based on where the furthest forward part of the torso is on the photograph and the time is read from a scale on the bottom.
"Flash" times, which are unofficial, but immediate are taken via a photo electric cell. Anything that crosses the beam along the finish line will stop that clock. This is why "flash" times are often different to photo finish times.
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