A textbook on mechanical and electrical engineering (1902)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 290
would be no different from that alreadydescribed. It is customary, however, in first-angle pro-jection, to assume that suchupright surfaces are always bentdownwards and away from the plan; to accomplish thisresult, the secondary use of the projector is employed. Sup-pose, now, that the upright… … Fig. 11 on the drawing board included between the angle/*(7/*.The paper on which the drawing is made is not of an irregularshape, thus to be bent up at will; further, the operations 3-2 PRACTICAL PROJECTIOX § 15 performed in projection drawing are such that they can beaccomplished only on the flat…
