Detroit. Public schools. Dept. of instruction, teacher training and research. [from old catalog], Kepler, Frank Roy. [from old catalog] · Detroit · leaf 12
e the line or surface until it is paral-lel with one of these planes; or assume a plane parallel to thesurface or line. A plane so assumed is an auxiliary plane ofprojection. 11 AUXILIARY VIEW It is often necessary to make a view of an object that is insuch a position that a suitable view is not… … vertical, or profile plane. A plane, parallel to the cuttingplane, is used and the projection is made on this plane. Aplane so used, or assumed, is called an auxiliary plane of pro-jection. The projection made on this plane, of the sectionmade by the cutting plane, will be the true size and shape…
Projection
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