The British Journal of Photography, 1890, Vol. 37 (Classic Reprint)

Download or read book The British Journal of Photography, 1890, Vol. 37 (Classic Reprint) written by and published by Forgotten Books. This book was released on 2018-03-20 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The British Journal of Photography, 1890, Vol. 37 As it is perfectly well known that hydrochloric acid has little or no effect on glass, I think I have demonstrated the facts as to the action of mercury and such mercuric compounds as are used in toning. That action may be partial, but in no way can the efiect ever be as it has been described. The imperceptible vapourisation of mercury at ordinary temperatures has no effect on ordinary glass, as ma be proved by the fact that a wooden bowl of mercury, holding a out 120 pounds, which has been in use for over twenty years, and when covered it was so by a bit of plate glass which, for a wonder, was not broken, when I examined it to-day, I found that the surface, save for accidental scratches, is just as it came from the factory. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.