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This differs from the preceding in that one face of the object is parallel to the plane of projection, and the projection is made by oblique lines instead of perpendiculars as in orthographic projection.

Elements of Mechanical Drawing: The Use of Instruments, Theory of Projection ... - Page 76
by Gardner Chace Anthony - 1904 - 152 pages
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The Theory of Engineering Drawing

Alphonse Andrew Adler - Mechanical drawing - 1912 - 372 pages

...the construction of the projection in Fig. 21. ABCDa'b'c'd' is such a right prism because the plane of the object is parallel to the plane of projection and the projecting lines are perpendicular to the plane of projection. 28 the draftsman intuitively makes the...

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