Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction (1915)
Armstrong, Henry F. (Henry Fry), 1868- · New York, J. Wiley & sons, inc.; [etc., etc.] · leaf 44
ously,and directed toward the planes of projection, the direction to be shown b)- theplan and elevation of an arrow line. Before commencing to work out the solutions for such shadow problemsas now to be dealt with, the student must endeavor to picture or imagine the solidor group represented by the… … Fig. 35- The student will not be able to make very satisfactory progress until he canreadily conceive mental pictures of what he has to deal with, realizing the relationof what he is picturing to the vertical and horizontal planes of projection, andjudging what the projections and other results…
Geometry, Descriptive
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