Excerpt from The Fire-Resistive Properties of Various Building Materials This bulletin contains the results of tests of thirty panels of vari ous building materials, made by the United States Geological Survey with a furnace in the Underwriters' Laboratories, Chicago, Ill., to determine the effect of fire and subsequent quenching with water on mortar building blocks made of river and slag sands; common, hydraulic-pressed, and sand-lime brick; gravel, cinder, limestone, and granite concrete; glazed building and partition terra-cotta tile; and limestone, sandstone, granite, and marble building stone. The mor tar building blocks and the concrete were made in the structural materials testing laboratories; the other materials, except some of the common brick, were obtained in the Open market at Chicago, Ill. 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.