Excerpt from Mining and Engineering World, Vol. 44: June 24, 1916 When it was decided some time ago to start a thorough investigation into the merits of flexible roller bearings in comparison with ordinary plain bearings for mine-car use, it was clearly seen that it would be very desirable to design a special testing device for that purpose. A device has been designed by the author in the form of a dynamometer car. This car is absolutely self - contained and is intended to be placed in front of the cars that are to be tested and behind the locomotive. 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.