Excerpt from Production of Gasoline by Cracking Heavier Oils The ordinary processes of refining crude petroleum yield a series of products differing widely in properties and commercial desirability. Those required for the smaller types of internal combustion engines, such as are now generally used in airplanes, motor boats, farm trac tors, motor trucks, and automobiles, are in greatest demand. Kero sene and fuel oil, which are used to produce light, heat, or power in competition with other more plentiful resources, such as coal, are less desirable with regard both to commercial profit and the conser vation of natural resources. Of the two types of products used in internal combustion engines lubricants and gasoline - the former does not seem as yet to Offer a problem in the conservation of resources. Gasoline is, however, being produced in such quantities that its continued use on the pres ent scale threatens to bring about the practical exhaustion of the country's underground supply of crude petroleum in the course of a few generations at most. The Bureau of Mines knows of no more important problem facing the country to - day than the conservation of this valuable natural resource, and has undertaken through the present investigation and other studies to promote greater efficiency in the utilization of crude petroleum. 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.