| 摘要 |
A light table (10) has tube illumination mounted below a glass top plate (14) and a negative is positioned and secured on the surface of the top plate (14) using finely drawn locating marks on the negative (22,23) etc. marks (15,16) on the top plate (14). A frame (2) supports gauze (3) which is under tension horizontally and vertically and is coated with a photosensitive emulsion. The frame has small side flanges (5,7) fitted with holes (6) and indentation (8) which interlock with complementary fittings (17,19,20) on the sides of the light table (10) such that the gauze is correctly registered with the negative
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