International Clinics, 1900, Vol. 2

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Excerpt from International Clinics, 1900, Vol. 2: A Quarterly of Clinical Lectures and Especially Prepared Articles The kromogram is prepared as follows: The three negatives are made with a specially constructed camera, preferably at a single exposure. The equal length Of exposure is made to depend upon the size of the diaphragm, for it requires a varying period of time to take a picture through the different screens. Thus, if it needs fifteen seconds for the red, it may require six seconds for the blue and two seconds for the green. The advantage of taking the three pictures at once IS manifest, as the object to be photographed is not so liable to change its shape, color, or form as when three exposures are taken. Neither are the changes of light apt to be so varied, and, if they occur, they will affect similarly all three of the pictures, and the color-effects will be alike in all. The positive record is next made by contact printing from the negative in the usual way. The glass plate is then cut in three and mounted on a special hinged frame. 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.