Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 129
afterward developed in a plane. Theeye is supposed either at the centre of thesphere or else its position is arbitrary. Thisconception gives rise to two kinds of de-veloped projections, one kind employinga cylinder, tangent generally at the equa-tor, the other employing a cone, tangentgenerally at… … /60 140 Fig. 247. TOPOGRAPHICAL DRAWING. 113 gator, as by it he can lay off his course on a straight line. In this projectionthe surface of the sphere is developed on a tangent cylinder. Conceive theoutlines of the continents to be drawn on this, and afterward the surface to beunrolled and laid…
Mechanical drawing
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