1 it is evident thatthe 45° triangle can be used to determine positively the light anddark faces only when these faces are perpendicular^ or nearlyso, to one or both of the coordinate planes. In B^ig. 18 the triangle can be used in both plan and eleva-tion, since every face is perpendicular to at… … Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 41 <^J>--.K Fig. 7 Fig.8 Fig. 9
Mechanical drawing
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