Lanterna Rally

Author: Isaiah Bowman

Publisher:

Published: 2016-06-27

Total Pages: 152

ISBN-13: 9781332789818

Excerpt from Water Resources of the East St. Louis District In the discussion and interpretation of data of the kind commonly considered in this report it Should be constantly borne in mind that whatever other qualities they possess, such discussions or conclusions are based upon evidence with which there must always be associated a certain degree of error. This is inevitable. The physicist or chemist dealing with precise measurements and accurately determined condi tions may state with assurance the result of experiment or calculation. Likewise the field geologist in mapping outcrops and Sketching sections deals directly with his subject; acquires information first hand. The hydrologist, on the other hand, acquires much of his information through a class of men, oftentimes unscientific, and these, standing be tween the fact and its interpreter, lend a certain inaccuracy to a state ment of fact in a report. This is by no means usually intentional or even conscious, but the natural consequence of defective memory often Slightly reinforced by preference for a familiar interpretation. Thus a well driller or well owner without a written record of a well section gives from memory an approximate section, and both the suc cession of beds constituting the section and the depths at which they occur may vary somewhat from the fact. Further than this, there is. No possible way to determine the precise depths of formations in a bore hole other than by cleaning out the hole thoroughly and getting a sample from the bottom. In ordinary drilling this is not practiced and the drillings from one formation are mixed with the next lower one. It will be observed that for the usual purposes of the hydrologist no such refined measurements as the above criticism implies are necessary, but errors arising from lapses in memory are oftentimes serious. There is also considerable variations among drillers in the use of such words as sand rock, shale, lime rock, etc. Where records are supplied from memory they must be carefully checked, both as to depths and rock quality, by more trustworthy records. 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.