Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 198
Another simple method of measuring a distance ACiicross a stream is shown in this rio-ure. Measure the angle CAX,either in degrees, with a pro-tractor, or by sighting along apiece of paper and markingdown the angle. Then go alongXA produced until a point B isreached from which BC makeswith A an… … AC A navigator uses the same principle when lie -doublesthe anode on the bow to rind his distance from a lio-ht-house or other object. If he is sailing on the course ABC and notes a lighthouseL when he is at A, and takesthe angle A, and if he noticeswhen the angle that the light-house makes with…
Geometry
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