

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. 



\ 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. 



