[1] He also worked in film administration, directing the cinematography department at MGM, and was president of the American Society of Cinematographers from 1931 through 1937, and again from 1939 to 1941.

[2] Arnold's first film was 1914's Springtime, directed by Will S. Davis and starring Florence Nash, Adele Ray, and William H. Tooker.

[14] With the advent of sound pictures in the late 1920s, Arnold was chosen to sit on a panel of industry experts in the fields of film engineering, projection, and cinematography to discuss and establish screen proportions and other issues which arose with sound pictures.

After her departure, Arnold was given a long-term contract by MGM, where he had been since they opened their west coast studios in 1916.

[7] In 1929 Arnold invented a new type of "sound-proof" camera, to reduce the noise in filming sound productions.

[22][23] Arnold was elected to his first term as president of the American Society of Cinematographers in 1931, a position he would hold through 1937.

[27] Late in 1932 Arnold was elected to the Technical Committee of the Motion Picture Academy (MPA).

[29][30] In the early 1930s, Arnold developed an attachment for the Mitchell Camera, which reduced the noise created during filming.

At the hearing held in Washington D.C., Arnold was included as one of a long list of speakers who had requested to be heard.

[37] His attendance at the hearings in Washington caused him to miss the wedding of his good friend, Lee Garmes, for whom he was supposed to be the best man.

[38] By the end of 1933, Arnold's rotambulator was in use at several studios, replacing the tripods, dollies, and light cranes.

[39] In 1935 Arnold invented a new type of camera blimp, decreasing the weight of the old model from 240 to 100 pounds, and including an automatic finder.

[40] Also in 1935 Arnold invented a mechanism which allowed film crews to drop "free heads" on large cameras.

[22] In 1935, not only was he re-elected to the MPA's technical committee, but he was also elected to their Board of Governors, representing technicians.

[43] In 1937, Arnold decided not to run, due to potential conflicts of interest with his position at MGM, and was replaced by Victor Milner, who was elected in October 1937.

Told in simple, informative and graphic style, the book covers the entire field, from the selection of the story, to the editing of the film."

[51] By the end of 1940 Arnold had been selected to serve on the MPAA's Production Defense Co-ordination Committee.

The committee was set up by the Research Council of the Academy of Motion Picture Arts and Sciences (AMPAS).

[57] In 1942 Arnold was again a member of an AMPAS committee, this one recommended changing the film speed from 24 to 18 frames per second.

[58] That same year, Arnold was selected to be the sole cinematography representative on the industry's War Activities Committee.

[59] In 1942 Arnold was one of a handful of cinematographers selected to train servicemen in the Signal Corps on how to take combat footage.

The film was shot from the POV of the protagonist, and the independent wheels allowed the camera to "walk" through doorways and upstairs, simulating natural movement.

He replaced the stationary base with a rotating one, which allowed the camera to have film installed on either side, which was necessary for the 3 negative rolls to occur.

He came up with the design to fill the need of his studio for rugged mobile transport to move cranes quickly from one location to the next.