Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 67
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 a and 6 and also through a and b are the projec-tions of the lines ab. The traces of ab are at vt and ht (§ 31).From Fig. 47, it will be… … Fig. 47 IV, § 44] VAEIOUS QUADRANTS 51 rant, through V, and hence into the second quadrant; andfrom there through H, and hence into the third quadrant. If now we turn to Fig. 48 a, it will be seen that all pointsbetween vt and M do actually correspond to the typical case forpoints in the second…
Geometry, Descriptive
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