Camera sensitive photographic materials became available, cameras began to incorporate mechanical shutter mechanisms that allowed very short and accurately timed exposures to be made. The use of photographic film was pioneered by George Eastman, who started manufacturing paper film in 1885 before switching to celluloid in 1889. His first camera, which he called the "Kodak," was first offered for sale in 1888. It was a very simple box camera with a fixed-focus lens and single shutter speed, which along with its relatively low price appealed to the average consumer. The Kodak came pre-loaded with enough film for 100 exposures and needed
Western roll efficient than the straddle technique, a style that evolved from the Western roll when the rotation of the body was increased to the point where the bar was crossed face down. Western roll The Western roll is a high jump technique invented by George Horine of Stanford University. It is said that George Horine came to invent the Western roll because the high jump pit at Stanford could be approached from only one side. Another, perhaps more plausible, explanation is that the style was invented by the Stanford coach Edward Moulton. However, neither of these stories occurs in a detailed