Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 209
CenteringSquare <-—^ Fig. 178.—Methods of CenteringFOR Lathe. … centres. This hole gives the centres a good hold, and at the sametime prevents burring. Centre turning should never be at-tempted on the punched centres without drilling, as, in additionto damage to the lathe centres, the work often runs out of truth. LATHES AND LATHE WORK 193
Metal-work
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