Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 230
he front and rear faces of the wall as V planes, andthe ceiling and floor as H planes. Let the line ab, Fig. 191, represent the axis of the shaft. Thisshaft is to have, as its right section, a square 3 0 on each side.The projections of such a section, having its center at anypoint, o, on ab, may be… … The traces of these lines (§ 31) on the surfaces of the wall andfloor establish the required holes. [Note. At tliis point the student can also make an application ofthe priiiciples of Chapters I to V to the elementary problems in shadesand shadows, given in §§ 202 to 210.] CHAPTER XAPPLICATIONS…
Geometry, Descriptive
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