Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 130
of contact; A M will be theradius for the central parallel and A the point from which all parallels aredescribed. Fig. 250 shows the cone developed on a plane surface. Thelength of a degree on a meridian of the earth is 69-41 miles at the poles and68-70 at the equator. Bonnets Projection.—In this… … Fig. 249. 114 TOPOGRAPHICAL DRAWING. conic projection drawn through the graduation of the central meridian. Eachparallel, however, is divided in accordance with the varying lengths of a degreeof longitude in the different latitudes (see table) and an arc passed through
Mechanical drawing
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