| 摘要 |
<p>PURPOSE:To improve the exactness and quickness of an operation by juxtaposing a pair of gray scales which are reversed in the directions of density from each other and forming the images of the gray scales positioned and printed in such a way that the steps of the same number among reference steps are on the opposite angles from each othr on a plate material. CONSTITUTION:A pair of the gray scales S1, S2 printed on a plate material are reversed in the directions of density from each other and are positionally controlled and printed into the diagonal state in which the steps of the same numbers are respectively on the back angles with respect to the steps of the two same serial numbers selected from both scales, i.e., reference steps 4 and 5. The operator is therefore forced to check visually the solid condition by comparing simultaneously both of the intended numbers disposed in the symmetrical positions in the stage of making such checking with the individual steps and the reliability and ease are given to the operation for checking the solid of the individual steps by the operator.</p> |
