Higbee, F. G · New York, John Wiley & Sons · leaf 49
square in this plane,and show three views of it. CHAPTER VI REVOLUTION OF POINTS 30. One of the most important operations in descriptivegeometry and the means by which a great many problems aresolved is the revolution of a point, or a Hne, from one position toanother. The actual laws governing such… … Fig. 35. 31. When a point revolves about a Hne two things are ap-parent at once: 1. That the point describes a circle in space. 2. That the plane of this circle is perpendicular to the line.Put in other words, the revolution of any point about an axis takes place in a plane perpendicular to the…
Geometry, Descriptive
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