Excerpt from The Rare Earth Industry, Including the Manufacture of Incandescent Mantles, Pyrophoric Alloys, and Electrical Glow Lamps Occurrence - Geographical Distribution Of Tungsten Ores - Concentration of Ore - Production Commercial Value of Ores - Manufacture of Metallic Tungsten and its Salts - Preparation of Metallic Tungsten - Cost of Production - ferro-tungsten - Ductile Tungsten - Pro perties of Metallic Tungsten - Utilisation of Metallic Tungsten and its Salts - Tungsten Steel - Bronze Powders - Estimation Of Tungsten in Ores, etc. 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.