Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 131
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 … Fig. 250. these points. The map is slightly distorted at the corners on account of theparallels, as projected, being concentric arcs. The great advantage of Bonnesprojection is that true proportions of areas are preserved. This method is al-
Mechanical drawing
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