Excerpt from Description of the Barr and Stroud 9-Foot Horizontal Base Self-Contained Range Finder, Type F. Q. 2, With Instructions for Its Use 3. The case is composed of drawn-brass tubes reenforced by gun metal castings, assembled in such a way as to form for the greater length of the instrument a double envelope with an air space between the tubes. Upon the case are carried the bearing rings, eyepieces, the finder, the night lamp and push, the elevating rack, the working head cover ring, and the necessary parts for carrying the inner tube, or frame. Under the working-head cover ring are located the work ing and adjusting heads and sliders, viz, the deflecting head, the. 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.