Excerpt from Laboratory Manual of Bituminous Materials: For the Use of Students in Highway Engineering During the past five years a number of our leading universities have inaugurated courses in highway engineering in which laboratory instruction is given in the testing of bituminous materials. A general tendency appears to exist upon the part of many other educational institutions to develop the same line of activity because of the desire of highway engineers throughout the country to familiarize themselves with these materials. While numerous technical and scientific papers have been published upon this subject in more or less detail, no attempt has as yet been made to furnish the student in highway engineering with a complete laboratory manual. As the result of his experience since 1912 in laboratory instruction in bituminous materials given in the Graduate Course in Highway Engineering at Columbia University, the author has endeavored to prepare a manual which may perhaps fill a want both upon the part of instructors and students and also those highway engineers in charge of State, county, or municipal work who have, or expect to have, a laboratory at their disposal. The author fully realizes that no first attempt along this line is apt to meet the many-sided demand, and will welcome criticisms and suggestions from those who are sufficiently interested to make them. In the preparation of this manual no attempt has been made to trace down the obscure origin of many methods of testing which are described. The author has, however, endeavored to give credit in all cases where the originator is known, and if by chance any are unintentionally slighted, he takes this occasion to offer his sincere apologies. Many of the methods described are taken practically verbatim from U.S. Department of Agriculture Bulletin No.314, by Hubbard and Reeve. 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.