Excerpt from The Weathering of Coal, Vol. 4 The Engineering Experiment Station was established by action of the Board of Trustees December 8, 1903. It is the purpose of the Station to carry on investigations along various lines of engineering, and to study problems of importance to professional engineers and to the manufacturing, railway, mining, constructional and industrial interests of the state. The control of the Engineering Experiment Station is vested in the heads of the several departments of the College of Engineering. These constitute the Station Staff, and with the Director determine the character of the investigations to be undertaken. The work is carried on under the supervision of the Staff; sometimes by a Research Fellow as graduate work, sometimes by a member of the instructional force of the College of Engineering, but more frequently by an investigator belonging to the Station corps. The results of these investigations will be published in the form of bulletins, and will record mostly the experiments of the Stations own staff of investigators. There will also be issued from time to time in the form of circulars, compilations giving the results of the experiments of engineers, industrial works, technical institutions and governmental testing departments. The volume and number at the top of the title page of the cover are merely arbitrary numbers and refer to the general publications of the University of Illiis; above the title is given the number of the Engineering Experiment Station bulletin or circular, which should be used in referring to these publications. For copies of bulletins, circulars or other information, address the Engineering Experiment Station, Urbana, Illiis. 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 techlogy 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.