anic tellme how I can bore out true a segment of a hollow cylindri-cal ring, the segment being the sixth part of such a ring, thediameter of which is two feet, and the diameter of the borebeing required to be six inches ? I sent you what I supposed to be a true plan for the pur-pose, but in your… … Make a wooden frame, into which fasten the segment to bebored, with the bore down. Place this frame in front of anengine lathe opposite the face plate. Turn a piece of roundiron about one third the diameter of the bore of segment,and bend it over a turned circle the same as desired (viz.,two feet);…
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