72 



SCIOPTICON MANUAL. 



MARCT'S PHOTOGRAPHIC PRINTING APPARATUS FO* 

 PRINTING WET PLATEN BY LAMPLIGHT. 



This apparatus is intended to simplify the process of 

 printing lantern transparencies. Its rationale will be 

 seen at a glance. 



Sharp photographic printing without a camera, can be 

 effected, either by having the negative in actual contact 

 with the sensitive plate, however widespread the light, or 

 else by having an intense light proceeding from a single point, 

 though the plates may be wide apart. In the latter case 

 the point of light should be distant compared with the 

 space between the plates, to avoid enlargement. A 

 sharpness above criticism is produced by this printing 

 apparatus, not by an absolute compliance with either 

 condition, but by an approximate observance of both. 



Fig. 24. 



It consists of an upright frame in which the sensitive 

 plate is held slightly separate from the negative, and a 

 coal oil lamp, from which the light of a wide flat flame 

 is emitted through a narrow horizontal slit small and 

 at considerable distance from the frame to produce a 

 sharp print, and in range with the long diameter of the 



