The Encyclopaedia Britannica Tonalite Vesuvius PDF Download

Excerpt from The Encyclopdia Britannica, Vol. 27: A Dictionary of Arts, Sciences, Literature and General Information; Tonalite to Vesuvius The ctice of finishihg-metallic surfaces bit-grinding. Though very olgrais nevertheless with regard to its. Rivalry with the work of the ordinary machine tools a development of the last part of the lgth century. From being a non recision method. Grinding has become the most perfect device or producing accurate results measured precisely within thousandths of an inch. It would be rather difficult to mention any class of machine-shop work which is not now done by the grinding wheel. The most recent develop ments are. 'nding Out engine cylinders and grinding _the _lips of twist drills g automatic movements, the drills rotating constantly. 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.