Manual of Instructions for the Survey of the Mineral Lands of the United States

Manual of Instructions for the Survey of the Mineral Lands of the United States

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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. 1909 Excerpt: ... the proper year from the following data: For Zeta Urs. Maj JjjjJm'n jannual increase 0.35 m. For Delta Cass m'n jannual increase 0.33 m. The diagram held perpendicular to the line of sight directed to the pole, with the right hand side of the page uppermost, will represent the conf1guration of the constellations with Polaris near eastern elongation at midnight about July 10--inverted, it will show Zeta (C) of the Great Bear and Polaris on the meridian (the former below and the latter above the pole) at midnight about October 10; and held with left hand side uppermost the diagram will indicate relative situations for midnight about January 10, with Polaris near western elongation. The arrows indicate the direction of apparent motion. Zeta (C) of the Great Bear (also sometimes called the Great Dipper), was called Mizar by the ancient Arabians, and the small star near it Alcor. Mizar is the star nearest to the end star of the handle of the dipper. TO FIX A MERIDIAN AT OTHER TIMES, BY HOUR ANGLE. 307. The annexed diagram (fig. 2) will show in their proper relation the various aspects of Polaris in its daily apparent motion around the north-polar point. This must be carefully studied, as the illustration of Table V, for finding at any hour the hour angle and azimuth of Polaris, and the resulting meridian, at times when more direct methods are not available. 308. Hour angle of Polaris. In fig. 2 the full vertical line represents a portion of the meridian passing through the zenith Z (the point directly overhead), and intersecting the northern horizon at the north point N, from which, for surveying purposes, the azimuths of Polarisare reckoned east or west. The meridian is pointed out by the plumb line Fig. 2. when it is in the same plane with the eye of the obse...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.


Title:Manual of Instructions for the Survey of the Mineral Lands of the United States
Author: United States Land Office
Publisher:Rarebooksclub.com - 2012-05
ISBN-13:

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