Stuart, Edwin Roy, 1874- · New York, McGraw-Hill · leaf 27
select 1,000 yards as the main divisionof the scale. A reading scale showing 6,000 yards will thereforebe 10.8 inches long. By a construction similar to that shownin Fig. 3, divide a line 10.8 inches long into six equal parts. Sub-divide the .extension into ten equal parts. The main scale willshow… … Fig. 3.—Division of Scales. Rules for the Construction of Reading Scales. In general, toconstruct a reading scale: 1. Determine the R.F. of the map. If this determination resultsin a near approximation to a decimal ratio or to one of the frac-tions representing the inch-to-mile ratios, it should be…
Military sketching · Maps, Military
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