Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 29
Fig. 38 H projecting: planeas auxiliary plane … Fig. 39 Using any auxiliary plane POINTS, LINES AND PLANES 19 file Plane, so also must the line of intersection be perpen-dicular. The V and H Projections, therefore, of this lineare the projections of the line of intersection of the twoplanes parallel to the GL. 28. To find where a line pierces a…
Shades and shadows · Geometry, Descriptive
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