Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 56
)ic in this chapter, its close analogy to the foregoing matter may justify a lew words at thispoint on the construction of a relief-jiersijective. 155. In Fig. 96 the plane P Q is called the plane of homology or pidure-plane, and—adoptingCremonas notation—we will denote it by tt. The vanishing… … 50 THEORETICAL AND PRACTICAL GRAPHICS. the centre of homology or perspective-centre. All points in the plane n are their own perspectives or, inother words, corresimid to themselves. Therefore B is one point of the projection or perspective ofthe line A B, being the intersection of A B with tt. The…
Mechanical drawing · Lettering
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