Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 162
t itis a simple, cheap, and handy supplement to it, as itmay be readily used for small angles and short dis-tances where there are mechanical difficulties in work-ing with the metal three-arm protractor. Other pro-tractors can be used for the three-point problem, as, forinstance, Custs protractor… … ■ -*«». a*-- ■m~--..r- *&*.■ FIG. 48. THREE-ARM PROTRACTOR IN USE ON A CHART, PLOTTING POSITION FROM TWO ANGLES, (145) Degree of Reliance 147 as skill in preparation and publication may give ahandsome appearance to an incomplete survey. Onthe other hand a thorough survey might through…
Nautical charts
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