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 33
Fig. 79. Fig. 80. 44 ROGERS DRAWING AND DESIGN. angle ; the two short sides of the triangle are ofequal length, Fig. 79. The other triangle should contain one angle of90 degrees, one angle of 30 degrees (that is equal … Fig. 81. to one-third of a right angle) and one angle of 60degrees (that is equal to two-thirds of a rightangle.) In this triangle the shortest side is equalto just one half the longest side, Fig. 80. The first triangle is called the 45-degree triangle, the second, the 30-degree triangle or the 60…
Mechanical drawing · Machine design
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