| 摘要 |
453,644. Microphotographs of type matter. HOUTERMANS, F. G., 27, Silverdale Gardens, Hayes, Middlesex, and WRIGHT, W. D., 8, Oakfield Road, Southgate, London. Jan. 24, 1936, No. 35848/34. Drawings to Specification. [Class 98 (i)] Typographical matter is reproduced with a large reduction ratio by first preparing a negative at an intermediate reduction ratio, e.g. 7: 1, under conditions producing high contrast, copying this negative without reduction to form a positive, producing therefrom a negative at a final reduction ratio under conditions producing minimum loss of definition, and producing the final positive therefrom without reduction. The intermediate negative may be made on standard kinematograph film and is developed quickly in a strong developer. A positive is made from this by contact or projection printing and the negative therefrom is developed slowly in a weak developer. The final positive may be made by contact printing. |
