Identifier: newtreatiseonpra00thomrich (find matches)
Title: A new treatise on the practice of navigation at sea : containing all the details necessary to enable the mariner to become a good practical navigator.
Year: 1902 (1900s)
Authors: Thoms, William
Subjects: Navigation Nautical astronomy
Publisher: New York : Printed for the author and sold by John Bliss & Co
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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of Maryland is 38 miles distant in a N. W. direction. The Positions by the Second Altitude laid off and the second line drawn between them passes through Cap*Henry. Hence its true bearing is W. by ; S. from the Ship. The Ships True Course and Distance W. by S. 20 miles, being now laid off from the first line and a line drawnparallel to it, then where it cuts the second line, is the Ships True place (at the time of the last Altitude), in Latitude37° 13 N. and Longitude 75° 8 W., and distant from Cape Henry 50 miles. A line drawn parallel to the Course made in the interval, through the True place of the Ship, back t9 the first linewill show the Ships place on that line, when the first Altitude was observed, in Latitude 37 18m N. and Longitude14° 43 W. Hence the Ships Latitude by Dead Reckoning was found to have been 18 miles in Error, or that muchtoo far to the Northward of her proper position, in running for Cape Henry. FINDING- THE SHIPS POSITION BY SUMNERS METHOD. 153 Fm. 27. # 1
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