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 125
on ; we see then,that the hexagon is symmetrical in regard to thecenter line AB also. In all cases where a view is symmetrical in re-spect to two lines, both of these lines must bedrawn. Wherever the view is symmetrical to oneline only, not more than one center line must bedrawn ; in Fig. 248 all… … B Pig. 248. A center line should never be used as a dimensionline, but such lines may be laid off from the centerline on both sides of it. ROGERS DRAWING AND DESIGN. 141
Mechanical drawing · Machine design
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