that if the portion of the chuck, B the lever or arm to be bored, C the shown, we mark off with the scribing block the lines, C C work has the hole, parallel with the line, B, bored, and the stud, and D D the plates bolted against the chuck so tha end faces round that hole trued with it, we have… … from moving sideways during the operation of boring. Th" measure the hight of the face, G, and that of the face, H, latter a weight sufficient to act as a counterbalance, such a use of this stud, modified in shape to suit the work, is als° both from the line, C. weight being shown at E, in Fig.…
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