Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 48
T, SCREW Fig. 28. — Ordinary BowDividers. 24. Bow Dividers. The bow dividers(see Fig. 28) are used in the same mannerand for the same purpose as the largedividers (see page 26, § 23). The bow dividers when once set main-tain a fixed distance or radius and there-fore in stepping off distances they… … 25. Bow Pencils. This instrumentis practically a pencil compass of smallradius. In making small arcs or circlesit has the advantage of being easier tohandle than the large compass, also indrawing several arcs or circles of thesame diameter (as for example in repre-senting bolt holes, boiler tubes,…
Mechanical drawing
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