Higbee, F. G · New York, John Wiley & Sons · leaf 35
A convenient method of showing the relation of the H, V, and P planes for thethird quadrant, and of the projections of any given line on the planes. … A convenient method of visualizing any given problem in projection. The pencilis held in the position of the given line and its projections on the cardboard planesmay be drawn. /. When a line is perpendicular to H or V its view on H or Vwill be a point. The other view will be equal in length to…
Geometry, Descriptive
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