The Kodak No. 1, on the market between 1889 and 1895, came pre-loaded with film for a hundred round photographs, each with a 2½ inch diameter. The images were round for two reasons - firstly because the camera had no view finder and, unlike a square picture, the photographer did not have to hold the camera level to get a straight image. Secondly, the corners of the photographs tended to be low quality.
When the 100 photographs were taken, the photographer sent the entire camera to Kodak for the film to be developed, and the camera was returned reloaded with film.
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All pictures: National Science and Media Museum / Kodak Museum