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)
Thoms, William · New York : Printed for the author and sold by John Bliss & Co · leaf 52
only 30 of these miles long ; near the Pole one mile of Latitude is nearly the length of 60miles on the Equator, and the Degree of Longitude only 1 mile long. But as the Polar Seas are not navi-gable much above 80°, Charts or Tables on this projection are rarely published beyond that paralleL… … 90 80 -70 60 50 40 30W E 5 T L 0 N CT ^ o io ao EAST LOnC PROJECTED BY THE FOLLOWING TABLE And the Measurements taken from the Degrees on the Equator. From the Equator to Lat. 10° the Expansion is 0° 3 From Lat 10° to 20 (( 0 25 l( 20 to 30 « 1 28 t* 30 to 40 3 43 M 40 lo 50 it 7 54 U 50 to 60 t.…
Navigation · Nautical astronomy
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