Excerpt from Motion Picture Projectionist, Vol. 4: November, 1930 During the next three weeks an advance educational program will be conducted to pave the way for the standard. It is hoped to reach every theatre, exchange, and studio in the country acquainting theatre and ex change managers, projectionists, film editors and laboratory executives with the features of the new standard. In bringing about a uniform method of change-over, one of the most irk some problems in projection should be solved. At the present time the individual projectionist puts on his own change-over marks. These ac cumulate and give rise to a constant demand for replacement by exchanges. 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.