Higbee, F. G · New York, John Wiley & Sons · leaf 50
en 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 axis. 32. Fig. 35… … or the plane of the axis, it will be at Ah and that the distance fromAh to the axis is equal to the radius of the circle. In terms of the distances which are shown by the plan andelevation of point A, thisradius is equal to the hypot-enuse of a right trianglewhose base is equal to thedistance a is…
Geometry, Descriptive
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