John Jacob Holtzapffel · digital reprint by www.CircuitousRoot.com · leaf 401
375 THE MODERN OVAL CHUCK. are necessary to the parallelism of the members of such mould- ings, so that the ring more usually remains at the same eccen- tricity throughout. On the other hand, when portions of the solid largely differ in size similar proportions may be desirable, and this is… … called concentric, by relatively decreasing or increasing both the eccentricity of the ring and the radius of the tool, as the latter is shifted from place to place towards the center when working on the surface or to the various diameters upon the edge of the solid. The reduction of the circular…
Ornamental turning
Internet Archive · Dr. David M. MacMillan · Public Domain Mark 1.0. Free to use for anything.
