Elgin Lessley
Elgin Lessley was an American handcrank cameraman of the silent film eraa period of filmmaking when virtually all special effects work had to be produced inside the camera during filming. Though Lessley worked earlier with Roscoe Fatty Arbuckle, and later with Harry Langdon, he is best known for the groundbreaking effects he produced with Buster Keaton, who dubbed him the human metronome for his ability to crank consistently at any requested speed.
Elgin Lessley was born on June 10, 1883, to Orpha and Shelton Lessley, joining a household with sisters Annette and Ora, uncles Herbert and Claude Brooks, and grandfather Burton Brooks. Another sister, Bindy, also joined the family.
Source: Wikipedia