Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 34
d with steel,the other with German silver, sothat the rubbing parts may be ofdifferent metals. Small set screwsare used to prevent the pivotedscrews from turning in the yoke.The contact .surfaces of this jointare made circidar to exclude dirtand to prevent rusting of thesteel face. The details of… … Fig. 20. Compasses Set for Drawing Circles in place by means of the screw,arrangement is not durable be-cause the sharp corners soon wear,and the pressure on the set screwis not sufficient to hold the shankfirmly in place. In Fig. 23 is shown a roundshank, the shank having a flattop, with a set…
Architecture · Building
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