Wall, E. J. (Edward John), 1860-1928 · Boston, Mass., American Photographic Publishing Co. · leaf 181
SCREEN-PLATES 169 the picture to be reproduced, with its glass toward the inside of the box, and behind the picture is placed the autochrome plate, with its glass in contact with the film of the picture; behind is placed the usual black card. G is a block of wood, or other support, preferably… … into the top is screwed an ordinary brass electric binding screw. ^ is a spiral of iron wire; G must be so placed that the spiral of wire is opposite the center of the filter, and about 5 cm from it. The spiral should be formed by coiling iron wire round a cylindrical rod of 3 or 4 mm diameter, as…
Color photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
