Single-exposure photo-finish images were made by a camera that was positioned at the finish line and initially applied to horse racing. The camera’s shutter which captured 136 images each second was triggered as a horse broke a thin thread on the race track. All too often, the single-exposure photo-finish camera failed to capture the decisive, first-place finish-line moment. These cameras only were used for first-place finishes, and provided no help in determining any of the other race placings. The oldest single-exposure race-track photo-finish images discovered so far were made by John Charles Hemment in 1890.