Cyclopedia of mechanical engineering; a general reference work. Editor-in-chief Howard Monroe Raymond. Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing (1908)
American School (Chicago, Ill.), Raymond, Howard Monroe · Chicago American Technical Society · leaf 27
e formof a graduated arc, is appliedto the bevelj making what isknown as a protractor, shownin Fig. 13. Tiiis tool can beused to find the angular rela-tion in degrees or to produce that relation bj setting to tiiepioper point on the graduated arc. As the center of a circle is found at the… … result. As one edge of the rule bisects the angle of the square,it is evident that a line drawn by that edge passes through thecenter of any circular piece to which the square is applied.Centering the ends of i-ound bars or circular work of any kindis the principal use of this tool. Tiie center…
Mechanical engineering
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