Rogers' drawing and design; an educational treatise relating to linear drawing; machine design; working drawings; transmission methods; steam, electrical and metal working machines and parts; lathes; boiler and parts; instruments and their use; tables, etc (1913)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 30
Fig. 72. Fig. 73. A dodecahedron is a solid, bounded by twelveregular pentagons. An icosahedron is a solid, bounded by twentyequilateral triangles. DRAWING BOARD, T-SQUARE AND TRIANGLES. The problems explained in the following para-graphs are but a small part of the great number ofproblems that may… … Fio. 74. In fact, all drawings, embracing straight lines only,may be drawn with the aid of the above instru-ments, provided the nature of the drawing does notcall for greater accuracy or for lines other thanstraight ones. In the latter case, the mathematical instruments described hereafter need to…
Mechanical drawing · Machine design
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