found: Dog shy [MP] 1926:credits (photographed by Floyd Jackman)
found: Internet movie database, December 21, 2018(Floyd Jackman (1885-1962); also known as G. Floyd Jackman; cinematographer; brother of Fred Jackman)
found: Walker, B. Mack Sennett's fun factory, c2010:p. 570 (cameraman Fred W. Jackman was the brother of G. Floyd Jackman who also worked as a cameraman for Mack Sennett in 1918-1919)
found: U.S., World War I Draft Registration Cards, 1917-1918, viewed December 21, 2018 via Ancestry.com(George Floyd Jackman; cameraman for Mack Sennett; born March 27, 1885; wife, Leila B. Jackman)
found: U.S., World War II Draft Registration Cards, 1942, viewed December 21, 2018 via Ancestry.com(George Floyd Jackman; dentist; born, March 27, 1885 in Tama, Iowa; wife, Leila B. Jackman)
found: Find-a-Grave, viewed December 21, 2018(Dr. George Floyd Jackman; born,1885; died,1962)