Excerpt from First Annual Report of the State Oil and Gas Supervisor of California for the Fiscal Year 1915-16: Covering Operations of the Department of Petroleum and Gas of the State Mining Bureau The best method of using the written logs of wells is by making from them a drawing showing all the information. Fig. No. 12 shows the conventional symbols and details adopted by this bureau. The various drawings of individual wells, along some approximately straight line on the ground, are grouped on a single drawing called a cross section. They must be properly located on the drawing, relative to distances apart and elevations above sea level. The appearance of such a cross section and its value are illustrated by the following sketch (fig. 13) of the bottom of four wells in the Coalinga field. 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.