This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1852 Excerpt: ...2), the level of which is required; the surveyor now turns his telescope towards it without moving or disturbing its adjustments, and takes another observation, noting it as before; and the former sight is denomi nated the back sight, and the latter the fore sight; and they i placed in the book, thus--or back sight 3 ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1852 Excerpt: ...2), the level of which is required; the surveyor now turns his telescope towards it without moving or disturbing its adjustments, and takes another observation, noting it as before; and the former sight is denomi nated the back sight, and the latter the fore sight; and they i placed in the book, thus--or back sight 3 feet 6-tenths and 6-hundredths of a foot, and fore sight 5 feet and 2-tenths of a foot. Sometimes several successive fore sights are taken without altering the position of the level, in which case the fore sights become alternately back sights to the succeeding observations, as--It may be remarked that the position and height of the level are immaterial, and any trifling error in the adjustment is also rectified by placing it about midway between the stations. If the section be required for an especial purpose, it is necessary to number the stations, and chain the distances; which are entered in chains and links: miles are marked in the book thus--the surplus 5 chains at 1 mile being carried on to the next length of 7 chains, making it 12 chains. It is essential to hold the chain as nearly horizontal as possible, and not along the surface of the ground. Of course, in running check levels for the purpose of merely ascertaining the general correctness of a section, it is unnecessary to go over the ground in the same line, or to measure it; the comparative level of the several bench marks only being regarded; they may run down a turnpike road, if more convenient. The following is a good specimen of a field-book, and will explain the method of proceeding: The following cut represents the section of the above, the horizontal scale being 4 inches to the mile, and the vertical 100 feet to the inch: --The 1st column gives the number of the station; the ..
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Add this copy of The Illustrated Glossary of Practical Architecture and to cart. $69.07, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2010 by Kessinger Publishing.
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