America at Work, America at Leisure: Motion Pictures from 1894-1915, http://memory.loc.gov/ammem/awlhtml/awlhome.html. Created and maintained by the Motion Picture, Broadcasting and Recorded Sound Division, Library of Congress, Washington, D.C. Reviewed Jan. 2007

2007 ◽  
Vol 94 (3) ◽  
pp. 1047-1048
Author(s):  
A. Landsberg
Keyword(s):  
Motion Picture ◽  
Motion Pictures ◽  
Library Of Congress ◽  
Recorded Sound

Effects of Light on Schooling and Feeding of Jack Mackerel, Trachurus symmetricus

1968 ◽  
Vol 25 (2) ◽  
pp. 393-407 ◽  
Author(s):  
John R. Hunter
Keyword(s):  
Motion Picture ◽  
Nearest Neighbor ◽  
Motion Pictures ◽  
Separation Distance ◽  
The Other ◽  
Angular Deviation ◽  
Jack Mackerel ◽  
A Value

Schools of six jack mackerel each were photographed with infrared film at eight levels of luminance and also in darkness. Three indices were used to measure the behavior of the school from motion pictures. Two of the indices, mean distance to nearest neighbor and mean separation distance, were measures of the distances between individuals in a school; the other, mean angular deviation, was a measure of differences in orientation between individuals. A value for each index was calculated for each motion picture frame.From 12.1 to 6 × 10−6 ft-L no differences existed in the angular deviation of the school or in the distances between fish. At 6 × 10−7 ft-L the intervals between fish were much larger than at higher levels of brightness and groups showed little uniformity in their orientation. Below 6 × 10−7 ft-L (darkness) schools were dispersed and the distributions of values of angular deviation were random.The ability of jack mackerel to feed on live adult Artemia was also tested at eight levels of luminance and in darkness. The number of Artemia eaten at 6 × 10−5 ft-L was about half of that eaten at the normal daytime level of 12.1 ft-L. Few Artemia were eaten at 6 × 10−7 ft-L and none in darkness.Comparison of these data with measurements of light in the sea indicated that jack mackerel probably would be able to maintain schools near the surface on a moonless starlit night and that they probably could feed effectively near the surface on a full moonlight night.

C. Francis Jenkins, Pioneer of Film and Television

2014 ◽  
Author(s):  
Donald G. Godfrey
Keyword(s):  
Motion Picture ◽  
Early Life ◽  
Motion Pictures ◽  
Early Death ◽  
The West ◽  
Television Station ◽  
Broadcast Television ◽  
Large Screen ◽  
Film And Television ◽  
American Television

This is the first biography of the important but long-forgotten American inventor Charles Francis Jenkins (1867–1934). The book documents the life of Jenkins from his childhood in Indiana and early life in the West to his work as a prolific inventor whose productivity was cut short by an early death. Jenkins was an inventor who made a difference. As one of America's greatest independent inventors, Jenkins' passion was to meet the needs of his day and the future. In 1895 he produced the first film projector able to show a motion picture on a large screen, coincidentally igniting the first film boycott among his Quaker viewers when the film he screened showed a woman's ankle. Jenkins produced the first American television pictures in 1923, and developed the only fully operating broadcast television station in Washington, D.C. transmitting to ham operators from coast to coast as well as programming for his local audience. This biography raises the profile of C. Francis Jenkins from his former place in the footnotes to his rightful position as a true pioneer of today's film and television. Along the way, it provides a window into the earliest days of both motion pictures and television as well as the now-vanished world of the independent inventor.

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