[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 44
if we take any intermediatepoint of this curve, and let d be its posi-tion on the chart, d must be in the lineC F, otherwise when we construct thetriangle of Mercators sailing, we shallhave an angle at C different from E C F, the course; whichfor every point of the loxodromic curve is the same.… … Fig. 8. 38 NAVIGATION. To find the course from one point to another on the chart,all that is necessary is to draw a line, or lay down the edgeof a ruler, through the two points, and measure its anglewith any meridian. A convenient mode is to refer such lineby means of parallel rulers to the centre…
Navigation · Nautical astronomy
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