Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 88
Fig. 71 points o and b, no particular relations appear to exist between thetraces of Y and the projections of ab. However, the tracesof the line, m and n, being special-case points, do have a definite … relation to the traces of the plane. It will be seen that the Htrace of the line must fall in the H trace of the plane; and theV trace of the line must fall on the V trace of the plane. Why ? 72 DESCRIPTIVE GEOMETRY [VI, § 61 61. Special Cases. Special-case lines or special-case planesmay show…
Geometry, Descriptive
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