Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 69
ts. Figure 47 shows theline ab passing from ain the first quadrant to6 in the third. In Fig.48 a the projections ofthe points a and b areshown. Lines drawnthrough o* and 6* and also through o and 6 are the projec-tions of the lines ab. The traces of ab are at vt and ht (§ 31).From Fig. 47, it will… … Fio. 47 IV, § 44] VARIOUS QUADRANTS 51
Geometry, Descriptive
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