MECHANICAL METHODS OF ENLARGEMENT PRINT PRODUCTION AND RELATED PROCESSES IN USE AT THE LIBRARY OF CONGRESS.

The article discusses the mechanical methods of enlargement production and related processes in use at the U.S. Library of Congress. The production speed, which has been initiated by the continuous enlargers just described with their continuous rolls of sensitized paper in place of the cut sheets used in the past, is maintained in the next step, the automatic processing of the exposed paper. An important feature of these film processors consists of a continuous replenishment apparatus which maintains all the processing solutions at constant strength regardless of the footage of paper that passes through the solutions.