Excerpt from Ferric and Heliographic Processes: A Handbook for Photographers, Draughtsmen and Sun Printers This little handbook is intended to serve two classes of people. First, amateur photographers, with a taste for experiment, who may find in the prepara tion of their own sensitive papers much interesting work; and, secondly, draughtsmen, engineers, architects, surveyors, and others, who find the reproduction of tracings and drawings a matter of every-day necessity. It would have been easy to have made the manual greatly exceed its present proportions but the writer has preferred to omit any notice of those processes, the difficulty or unreliability of which only makes their employment disappointing. Much, too, that might have been said on theoretical matters is omitted, the aim of the book being to be strictly practical. Mr W. E. Brewerton has kindly supplied partien lars of the process described in Chapter IV. 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.