A process of reproducing and exhibiting literary and pictorial matter, and apparatus therefor

摘要

357,136. Microphotographs of books. TIPECSKA, G. and MACH, L., 2, Schraudolfstrasse, Munich, Germany. June 13, 1930, No. 18193. [Classes 97 (i), 98 (i), and 98 (ii).] A lantern slide 28, Fig. 10, having microscopic images of the pages of a book or other matter with marginal indexes on the sides is made by first making a negative on a reduced scale and reproducing this negative with further image reduction to microscopic proportions. A slide holder is described having key-controlled means for stepping the slide in two transverse directions and scales for approximately positioning any image in a central aperture for projection. Apparatus described for making the slide comprises a camera 1, Fig. 1, for making the negative. The sensitive plate 5 is slidably mounted in a second slide which is adjustable in a transverse direction. One or a group of pages are successively mounted on the holder 2. The negative so produced is further reduced to obtain the desired micro-images by a camera 14, Fig. 5, in which both the negative 5 and sensitive plate 13 are mounted to move in two directions relatively to the lens 19, synchronous movement being obtained by a pivoted arm 24. The microslide holder, Figs. 12 and 13, comprises a base 34 with a central aperture for projection, a frame 36 vertically movable on the base, and a slide-holder frame 37 transversely movable on the frame 36. The slide is held on the frame 37, by springs 39, against an angle-piece 40. The frame 36 is urged downwards by a spring head 42 and is stepped by a key S which controls a double pawl escapement engaging a fixed rack 43 on the base. The rack 43 also carries a scale 45 over which a scaled arm 46 on the slide holder 37 moves. The transverse movement of the slide carrier frame 37 on the frame 36 is obtained by a pinion 44 and rack movement, operated either from the key Z through a pawl and ratchet movement 49, 50, or by a hand knob 41 on the pinion shaft. The position of the slide 28 vertically and horizontally is determined by the scales 45, 46 which correspond to the co-ordinate marginal indexes on the slide.