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POPULAR SCIENCE MONTHLY. 



viz., the display in rapid sequence of a long series of photographs, 

 which hence convey to the eye and brain the impression of a con- 

 tinuous and animated scene. In the kinetoscope the small pictures 

 are viewed through an enlarging lens by reflected light, whereas in 

 the cinematograph, phantascope, vitascope, etc., they are projected 

 upon a screen — a plan that is obviously best suited to the require- 

 ments of a public exhibition. 



A machine of the last-mentioned type may be shortly described 

 as a stereopticon, combined with such mechanism as is requisite for 

 the precise manipulation of the' celluloid picture film.* When the 



Machine for Projecting Animated Pictures on the Screen. The phantascope, latest 

 model, being an attachment for a J. B. Colt & Co. electric lantern. 



apparatus is set in motion the long band of celluloid passes quickly, 

 though not continuously, behind the projecting lens, between spools 

 or bobbins which revolve at a uniform rate. While thus passing 

 from its original spool to the winding reel the film encounters certain 

 pulleys and toothed rollers that serve to accurately direct its move- 

 ments. Along its edges are numerous small perforations, f into 

 which the teeth of the rollers fit with precision; and by this means 

 the small transparencies are made to occupy exactly similar positions 

 when their images are projected upon the canvas. As each picture 

 in its turn attains this critical position, it is momentarily brought to 



* See accompanying illustration of the phantascope. For this picture, and for the other 

 photographs here reproduced, I am indebted to Mr. C. Francis Jenkins, of Washington, D. C, 

 inventor of the phantascope, and the author of various notable improvements connected 

 with this branch of photography. 



f These small square holes — usually six or eight for each picture — are punched out with 

 great precision by a machine made for the purpose. They insure correct register, not only 

 in exhibiting but also in "printing" the photographs. 



