Herman Casler (March 12, 1867 in Sandwich, Illinois – July 20, 1939 in Canastota, New York) was an American inventor and co-founder of the partnership called the K.M.C.D. Syndicate, along with W.K-L. Dickson, Elias Koopman, and Henry Marvin, which eventually was incorporated into the American Mutoscope Company in December 1895. Biography Casler, Dickson, and Marvyn had worked together in 1893 on a detective camera the size of a watch called the Photoret. Dickson, who at the time was working for Thomas Edison, next proposed that they work on a peephole film viewing device superior to Edison's Kinetoscope machine. Casler, following Dickson's proposal, invented the "Mutoscope", which displayed short films through flip-cards rotated by a hand crank that could be slowed at the operator's will, unlike Edison's motorized Kinetoscope, in which films were viewed through actual 35 mm film. The prototype of the "Mutograph" camera was completed in November 1894, first tested with film in June 1895, and the first official Mutoscope films were made in August 1895. To avoid infringement on Edison's motion photo patents, the Mutograph camera used continuous movement friction rollers to move 68 mm film into the camera, instead of intermittent movement by sprockets as Edison's 35 mm camera did. Casler's patents, which he assigned to American Mutoscope in January 1896, were used as security for financing the new company. The Mutoscope became as popular in nickelodeon parlors as the Kinetograph. However, the first public demonstration of projected motion pictures in the United States had already occurred in April 1895. Casler then designed the Biograph Projector, which was introduced on a tour of vaudeville houses in September–October 1896. The 68 mm film that Casler's camera and projector used offered four times the image area of Edison's 35 mm film, a quality improvement noted by early viewers. Both the Mutoscope and Biograph had great success. The company name was changed to American Mutoscope and Biograph Company in 1899. Casler helped develop a portable hand-cranked camera in 1900 to replace the bulky, motor-operated camera used until then. After Biograph switched to 35 mm film production in 1902, and the number of frames per second was halved, Casler also helped John Pross to develop a three-blade projector shutter that greatly reduced flicker in the projected image. Casler was associated with Biograph until 1921 in the design and manufacture of motion picture cameras, projectors, automatic printing machines, and other special machines