A system of geometry and trigonometry : with a treatise on surveying (1830)
Flint, Abel, 1765-1825, Gillet, George, Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Hartford : Cooke & Co. · leaf 112
108 APPENDIX. CONVERGING OF MERIDIANS. The length of a degree oflongitude in any parallel of lati-tude is to the length of a degree upon the equator, as theco-sine of that latitude is to radius. R. : 60 miles* : : co-sine of the lat. : the length of a degreeon that lat. Rule III. Rule IV. N. 25° E.…
Surveying · Geometry · Trigonometry
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