Excerpt from Zircon, Monazite and Other Minerals Used in the Production of Chemical Compounds Employed in the Manufacture of Lighting Apparatus The production of zircon was not renewed at this locality until the introduction of the Nernst lamp, when again this locality was looked to as a source of zirconia. Shipments began In 1902 and have continued to the present time, although in no one year has there ever been any very large production. 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.

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List of members of the Institute in v. 24-26.

Vols. 1-69 include more or less complete patent reports of the U. S. Patent Office for years 1825-59. Cf. Index to v. 1-120 of the Journal, p. [415]