Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 131
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- … most universally employed for the detailed topographical maps based on thetrigonometrical surveys of the different countries of Europe. TOPOGRAPHICAL DRAWING. 115 Polyconic Projection.—This employs a tangent cone for every parallel.Each parallel of latitude therefore is independently developed.…
Mechanical drawing
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