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PR EFACE
THE carbon arc has the greatest brightness per unit area of any artificial light source known, rivaling that of the sun. It is not surprising, then, that it has been adapted to the projection of motion pictures, to the projection of stereopticon slides, to spot and flood lighting in theatres, to the lighting of studios for the taking of motion pictures, to the lighting of photographer's studios, to photo-engraving, to the large and powerful searchlights used by the Army and Navy, and last, but not least, to the modified type of searchlight used to illuminate the Air Mail Fields being established throughout the country. This book, however, will be largely confined to a discussion of the first mentioned use, that is, the projection of motion pictures.
In addition to being the most powerful source of artificial light, the carbon arc is also the most flexible. The light on the screen can be varied in intensity at the will of the projectionist. For light films the current can be reduced, and for dark or colored films, increased.
The carbon arc is easy to operate. A few rules, however, should be kept in mind. This book has been prepared with the idea of assisting projectionists to obtain the maximum efficiency from their carbons. While the discussion herein will be as comprehensive as possible, it may be that your particular problem of carbon arc projection has not been touched upon. If so, please feel free to write to the Canadian National Carbon Company, Limited, Carbon Sales Division, Toronto, Ont., Canada, or to discuss the matter with one of our representatives.