Radiographic Exposure Guides for Mud, Sandstone, Limestone, and Shale (Classic Reprint)

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Excerpt from Radiographic Exposure Guides for Mud, Sandstone, Limestone, and ShaleMany methods have been devised to enable the geologist to examine the internal composition of a rock specimen. Unfortunately, all have some inherent limitation. Thin sections of rock or impregnated sediment probably give the most complete presentation of structure and composition, but they present only a two dimensional aspect of a very small portion of the entire rock body. Serial section ing and point counting overcome this difficulty to some degree, but both methods are laborious and time consuming.An analysis of rock may be obtained much more rapidly by chemical and mechanical means. Such tests, however, normally require destruction of the sample, and in many investigations, samples represent considerable expenditure of time and money. Some specimens, in addition, are too small to permit multiple tests. In such cases, nondestructive tests, such as X-radiography, may be val uahle. Nevertheless, a serious limitation in X-radiographic technique arises from the fact that it essentially records density differences in material and fails, therefore, if factors affecting definition and contrast combine to reduce re solution below certain limits.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.