Excerpt from Experimental Study of the Relation Between Intermittent and Nonintermittent Sector-Wheel Photographic Exposures All plates were of the commercial 5 by 7 inch size. These were cut in one operation, by a special plate - cutting machine, into seven parts, giving five which are 1-33 - 2 by 5 inches, the two end strips being discarded. The plates after cutting are removed intact - that is, not broken apart - painted on the glass side with a black shellac mixture to prevent halation, and then drieifl in a ventilated closet. After drying they are broken apart and loaded into the plate holders, each having three pockets. In all experiments three kinds of plates were exposed in each holder; for example, A plates in the upper pocket, B plates in the center pocket, and 0 plates in the lower pocket. Since practically every experiment was made with eight holders, this gave 24 test specimens for each designated experiment. 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.