Excerpt from Journal of the Society of Motion Picture Engineers, Vol. 37: July, 1941 The science of photography is founded on the two great sister sciences, chemistry and physics, and it was only as our knowledge of these grew that progress could be made on the problems of photo graphic science. Until recently, photographic science tended to con sist of a chaos of observations, some of them of real value and others of very doubtful value, with little in the way of theories to connect them properly. It is only within the last few years that fact after fact has been falling into place in an ordered network. At the present time we can say that while much remains to be done, we have a very clear and definite science of photography - something which can be written out and generalized upon and to which the missing parts can be added as more work is done. 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.