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Excerpt from Description and Instructions for Use of Weldon Range Finder: One Plate; Revised March 1, 1906, Revised February 1, 1909, Revised September 2, 1911 The level, fixed below the third prism, is used to assist the observer in keeping the instrument upright when finding a range. Pasted on the inside of the cover is a sheet of memoranda giving the multiples to be used with the different prisms. 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.