The use of slit scan photography is actually quite old. It is often called line-scan, photo finish, or streak photography. Slit scan photography has a rich and colorful history rooted in chemical analog photography. This technique is often used to visualize high-speed events, such as missiles and bullets, although it is probably best known as photo finish photography that is used to determine the outcome of races.
In the past, slit scan photographic systems used a sheet of film that was moved past a slit. These cameras were most commonly used as photo finish cameras at races and, for example, could very precisely measure the time one horse might have won the race by. There were a number of designs of these types of systems. One of the most interesting slit scan cameras had the camera and film moving at the same time to create a panoramic picture. The last camera on the market to use this technique was the Spinner Dolphin 360 made by Lomography.