A Treatise on the Method of Government Surveying as Prescribed by the United States Congress, and Commissioner of the General Land Office: With Complete Mathematical, Astronomical and Practical Instructions for the Use of United States Surveyors in
A Treatise on the Method of Government Surveying as Prescribed by the United States Congress, and Commissioner of the General Land Office: With Complete Mathematical, Astronomical and Practical Instructions for the Use of United States Surveyors in
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: ...Therefore, Burt's rule is: " When running a parallel of latitude, if an object be observed due east or west, from any station, the correction of the course to touch the same parallel in the meridian of the object is equal to one-half of the angle of convergency between the two meridians, which pass ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: ...Therefore, Burt's rule is: " When running a parallel of latitude, if an object be observed due east or west, from any station, the correction of the course to touch the same parallel in the meridian of the object is equal to one-half of the angle of convergency between the two meridians, which pass through the station and the object." ln practice this accounts for taking one-half the difference between fore and back sights, and setting it off toward the pole for sighting a true parallel line. Or, the angle to start a line of sights, on an east and west line, is equal to one-half the angle of convergency. The formula for ascertaining the convergency, applied to government work either for a township or check, becomes: Cos lot. of south boundary; cos lot. of north boundary:: length of south boundary: length of north boundary. P, North Pole. ADC, Sighting Chord. A and C, Stations. AEC, Parallel of Latitude. AB, Tangent. With A P and G P as meridians, the station C would be observed an angular amount North of West of A B, the apparent and A E the true parallel, from the station A depending upon the latitude of that station. When running Standard Parallels the correction offsets can be used from each corner on the sighted line southward to proper corners on the parallel, or the correction angle for six miles may be tude of the eoutli boundary being 85 North, and length 42 miles, the latitude of the north boundary will then be 35 20' 52," as the east and west boundaries are 24 miles long, and the side of a township = 5' 13" difference of latitude. taken and set off from each township corner, applying the small Log cos lat 35 20' 52" 9.9115002 Log 3300 chains 3.5293393 Co log cos 35 0.0869355 Log 3345.98 3.5244840...
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Add this copy of A Treatise On The Method Of Government Surveying As to cart. $18.00, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
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Add this copy of A Treatise On The Method Of Government Surveying As to cart. $29.29, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2022 by Legare Street Press.
Add this copy of A Treatise On The Method Of Government Surveying As to cart. $41.39, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2022 by Legare Street Press.
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