Excerpt from An Introduction to the Study of Metallography and Macrography Metallography may be defined as the microscopical study of polished and etched metallurgical specimens. The examination is carried out not by transmitted light as in the case of many histological and petrological specimens, but. By reflected light; one face of the metal specimen is perfectly polished, then etched by a suitable reagent having a differential effect on the various constituents, and finally examined under the microscope at varying magnifications up to, and in special instances exceeding, one thousand diameters. Macrography may be defined as the study of coarsely polished and etched metallurgical specimens without the aid of a microscope. It is especially useful in the detection of certain qualities or defects, and also enables a general estimation of the constitution of the material to be made. 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.