The practical printer : a complete manual of photographic printing (1874)
Hearn, Charles W · Philadelphia : Benerman & Wilson · leaf 54
44 THE PRACTICAL PRINTER. You ask, Why not make all of the boards deep, as they will be much more handy ? Because the depth of the boards will cast a Fig. 15. … shadow over the impressions on the negatives if the rays of the sun strike them obliquely, and thus ruin the prints ; but this may be remedied, and the boards all made quite deep, by placing them when printing, up to the sunlight. This is not' always advisable, however. Fig. 16. In speaking of deep…
Photography -- Printing processes · Photographs on porcelain
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
