The essentials of illustration, a practical guide to the reproduction of drawings & photographs for the use of scientists & others (1915)
Hill, Thomas George, 1876- · London, W. Wesley & Son · leaf 67
negative is, in a sense, realised byoptical chemical means, although the dots in a half-toneblock are much coarser than those in a negative (Plate 5, Fig. 3)- This result is obtained by interposing between the diaphragm of the camera and the negative—for the half-tone process is a photo-mechanical… … Fig 4 It may at first be thought that the effect of such a screenplaced in front of the negative would be to producemerely a cross hatching on the reproduction ; this,however, is not the case ; if the screen be placed in aproper position relative to the negative and the size ofthe diaphragm of the…
Engraving -- Printing · Illustration of books · Photomechanical processes
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
