Blueprint reading; a practical manual of instruction in blueprint reading through the analysis of typical plates with reference to mechanical drawing conventions and methods, the laws of projection, etc (1919)
Fairfield, Howard Parker, 1858-, Kenison, Ervin, Waite, Edward B. (Edward Broughton), 1873-, American Technical Society · Chicago, American technical society · leaf 158
Fig. 26. Bow Pencil Fig. 27. Bow Pen Fig. 28. Bow Divider holes. When small circles are drawn, the needle point must beadjusted to the same length as the pen or pencil point. If a con-siderable change in radius is made, press the points together beforeturning the nut so as to prevent wear in the…
Mechanical drawing · Blueprinting
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