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Home > History and Archaeology > History > Finding the Error of the Marine Compass on Board Ship: (English)
Finding the Error of the Marine Compass on Board Ship: (English)

Finding the Error of the Marine Compass on Board Ship: (English)

          
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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. 1875 Excerpt: ... Azimuth.--Having the Data prepared, the True Azimuth by this method may be found either by Ijogarithmic Computation or by Tabular Inspection. a) By Logarithmic Computation.--Using Tab. IX: To the cosecant of the H. A. Interval (or W. Time Interval for the Sun) add the sine of "the Alt. Diff. and the secant of the Lat.; their Sum, rejecting tens from their indices, will be the sine of the True Azimuth, which take out, and mark it N or -S' according as the object is north or south of the Prime "Vertical, and E or W according as it is east or west of the Meridian. b) By Tabular Inspection.--Divide the Alt. Diff. by the H. A. or W. T. Interval, as the case may be, the seconds of both being reduced to decimals of the minute, and the result will be the Change of Alt. in Im. "With this, to the nearest tenth of the minute, and the Lat. enter Tab. XI, interpolating for tl: e tenths, and the corresponding tabular number will be the True Azimuth, which mark as prescribed in the preceding Hule. 1 It is of course necessary that the rate of the watch should be sensibly uniform -luring the Interval. 2 These Hour-Angles would, however, generally be deduced among the Data for the direct use of the observations in qnestiou..11. Examples of Finding the Compass-Error by a Transit ion-Azimuth..1.1. Possible Errors of the Azimuth-Data.--The Data employed in Unding the True Azimuth are always liable to be in Error, more or less, according to circumstances. Consequently, the resulting Azimuth, as obtained by either of the preceding methods, will be correspondingly uncertain; and, to the end that we may be able to form an intelligent opinion of the dependence to be placed on the results, it will be necessary to consider the several relations of the Data, as...


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Product Details
  • ISBN-13: 9781152534377
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 38
  • Series Title: English
  • Weight: 86 gr
  • ISBN-10: 1152534378
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 189 mm

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