Corporation, began working on a wide film format using 70 mm film which they named Grandeur. Cameras were ordered by Fox-Case from Mitchell Camera Corp, with the first 70 mm production cameras, designated as the Mitchell Model FC camera, delivered to Fox-Case in May 1929. This was one of a number of wide-film processes developed by some of the major film studios at about that time. However, due to the financial strains of the Great Depression, along with strong resistance from movie theater owners, who were in the process of equipping their theaters for sound, none of these systems became commercially successful. Fox dropped Grandeur in 1930. Todd-AO Producer Mike Todd had been one of the founders of Cinerama, a wide-screen movie process that was launched in 1952. Cinerama employed three 35 mm film projectors running in synchronism to project a wide (2.6:1) image onto a deeply curved screen. Although the results were impressive, the system was expensive, cumbersome and had some serious shortcomings due to the need to match up three separate projected images. Todd left the company to develop a system of his own which, he hoped, would be as impressive as Cinerama, yet be simpler and cheaper and avoid the problems associated with three-strip projection; in his own words, he wanted "Cinerama out of one hole". In collaboration with the American Optical Company, Todd developed a system which was to be called "Todd-AO". This uses a single 70 mm wide film and was introduced with the film Oklahoma! in October 1955. The 70 mm film is perforated at the same pitch (0.187 inch, 4.75 mm) as standard 35 mm film. With a five-perforation pull-down, the Todd-AO system provides a frame dimension of 1.912 inch (48.56 mm) by 0.816 inch (20.73 mm) giving an aspect ratio of 2.3:1. The original version of Todd-AO used a frame rate of 30 per second, 25% faster than the 24 frames per second that was (and is) the standard; this was changed after the second film – Around the World in 80 Days - because of the need to produce (24 frame/sec) 35 mm reduction prints from the Todd-AO 65 mm negative. The Todd-AO format was originally intended to use a deeply curved Cinerama-type screen but this failed to survive beyond the first few films. However, in the 1960s and 70s, such films as The Sound of Music (which had been filmed