File: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. (1902) (14763339622).jpg

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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ST 303020891522 27.7 11.5 11.520.0 3.810.6 4.S 27.7 10 6 ■ - . • • • • • 38.821.6 1 27.7 5(1.227 7 38.3 71.938.3 .43° 10 N..42 20N. Diff. Lat , Lat left. 43° Lat of the Ship.Lat. of the Port. Diff. Lat 60 Dep. 50, Gives the Bearing S. W And the Distance 70 mile* 22.5 S. and Dep... 33.6 W., gives the Course made good, S. 56° W., or S.W. byW10 N. and the Distance 40 miles. Lat. come to 42° 47. To find the Bearing and Distance of the intended Port. Take the whoI« Difif. of Lat. between the Ships 1st position and that of the Port, which is 50 miles, and the whole Departure 50.From which subtract the Diff. Lat. made good 23 and Dep. made good... .34. Leaves the Difference of Latitude to make 27 and the Dep. to make.. .16 Port These agree in the Tables to the Course 31°, or 2; points, nearly, and the Distance 31 miles; and as the inteodW)rt lies to the South and West of the Ship, she must steer S. 31 W., oi or S. S. W. S W., 31 miles. PROJECTION BY THE PLANE SCALE.Fig. 13.
Text Appearing After Image:
II TRAVERSE SAILING. n l>raw a figure as in the preceding example, the Ships position being in the Centre. Draw her parahel«f Latitude and her Meridian; from the Centre lay off the first Course Norlk 2 Points West 30 miles; layoff 6 Points from the South towards the East for the second Course, and mark it on the Circle. Lay theparallal ruler over this mark and the centre, and transfer this Course to ihe Ships place, and dra>y aline, on which lay off the Distance, 30 miles. Lay off the other Courses and Distances in like manner,and at the end of the last one is the Siiips place. From the Ships place draw a line to the Centre, whichwill be the Distance made good. 40 miles, and the Angle which thi« line makes with the Meridian is theCourse made good South 5 Points West. Through the Ships place, draw the parallel of Latitude comoto, and the ^ace between the parallels of Latitude is the difference of Latitude made good, 23 miles. Drawa Mer.dian line through the Ships place, and the

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