Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 51
the following paragraph. The half length of the minor axis of the lower ellipse may bedetermined by drawing F H through D, converging with E H. A Scale of Levels. The left half of Fig. 39 is a scale of levelsshowing the upper base of a measure cylinder at levels one-half 46 MECHANICAL DRAWING inch…
Mechanical drawing
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