The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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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