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 . given for theh)cation of the holes, it is understood that they are equally spacedaround this circle. Fig. 2l illustrates tliis. If the holes are noteipially spaced around the circle, they niay he located as shown inFig. 22. ])iametei-s of circles, and of arcs of circles which are greaterthan semicircles, should be given rather than radii, hut if the arcof the circle is less than
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 . given for theh)cation of the holes, it is understood that they are equally spacedaround this circle. Fig. 2l illustrates tliis. If the holes are noteipially spaced around the circle, they niay he located as shown inFig. 22. ])iametei-s of circles, and of arcs of circles which are greaterthan semicircles, should be given rather than radii, hut if the arcof the circle is less than a semicircle, its radius shoidd he given. Fig. 23 sliows how this should be done when tlie radius is large enougli to permit; but if the radius is small, or the dimensions would interfere with other -M parts of the drawing, it I may be done as in I Fig. 24. I In Fig. 28 a small circle is drawn (freehand) around the centerabout which the arc isdrawn, and a dimensionline carried from theedge of this circle to thearc; an arrowhead beingplaced on the arc, andthe figures placed in thedimension line in theusual way. In this caseit is not necessaiy to putthe letter R (abbreviation for radius) after the dimension. In. Fig. 20. the two methods shown in Fig. 24 the R should be placed afterthe figures. In putting dimensions on a drawing, the figures should beplaced to read from only two sides of the paper, usually from thebottom for dimension lines which are liorizontal, as the 2^ dimen- JIECnAN^ICAL DRANYING. 15 Bion ill Fig. 20, and from the riglit hand for dimension lines wliichare vertical, as the 2] dimension in the same figure. Dimensionsshould never be placed on center lines if it can be avoided. If a dimension is given in one view of an object, the samedimension need not be repeated in the other views. lu putting ou fractious it is better to have the line which
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