Excerpt from Proceedings of the American Railway Engineering Association, 1967, Vol. 69: Engineering Division, Association of American RailroadsThe report of the initial installation of 1296 treated specimens and 30 untreated control specimens, oak, pine and fir, placed in the exposure test plot in November 1957 is described in the 1959 Proceedings, Vol. 60, page 131. This detailed report covers the treatment of the specimens and chemical analysis of the preservatives. The specimens were treated with nine different preservatives using three different retentions for each preservative.A supplemental installation of 576 treated specimens and 15 untreated controls, involving the use of four additional preservatives, was made in November 1959.A detailed report covering this installation may be found in the 1961 Proceedings, Vol. 62, page 95.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.