Fry, Horace Pugh. [from old catalog] · Philadelphia · leaf 20
oughall axes of symmetry, the centers of all holes, bolts and rivets andwhere dimensions are to be given from some fixed line. The breakshould not occur where a line is crossed. (See Fig. 15.) 7. Center lines may be drawn continuous between differentviews of the same object; they must be offset for… … 18 9. Construction lines (see Fig. 13) are fine dash lines andare used largely in elementary work; they connect the projectionson two adjacent planes. These lines should not touch the pointsbetween which they are drawn. (See Figs. 9 and 10.)
Mechanical drawing
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