Photographic copying apparatus

摘要: 1,138,181. Photographic copying apparatus. BOWENS SALES & SERVICE Ltd. Feb. 28, 1966 [Nov.26, 1964], No.48128/64. Heading G2A. In apparatus for transparencies, the correct exposure required is assessed by measuring light transmitted through transparency a photo-cell. As shown, mounted in movable frame 15 over an aperture 13 top face 12 of housing 11. Below diffusing screen 14. The photo-cell enclosed case 17 which can slide on rails 16 into and out position (see also Fig.1, not shown). source may be single lamp but preferably assembly consisting flash tube 21 pair small incandescent lamps 122 see Fig. 3, These are carried support 19 moved up down vertical guide rods 23 means outside This movement out, using 22 as source, until predetermined reading obtained photo-cell, shown meter (35, then retracted path, photographic made tube.