Practical photography : being the science and art of photography, developed for amateurs and beginners (1881)
Wheeler, Owen, 1859-1932 · London : "The Bazaar" Office · leaf 42
he shops, for about 15s. Failing a desk, a beginner can effect great improvements in his negatives, even by working against a "window pane. Besides, by retouching and reintensification, a faulty negative can often, by skilful printing, be made to yield decent pictures.' A few hints as to various…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.