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 180
Fig. 148. DRILLING 163 … Fig. 149. 164 METAL-WORK In drilling, the point which marks the centre of the holeshould be accurately marked with the centre-punch, and, ifextreme truth of position is required, a circle marking theoutside of the hole should be described on the metal with thedividers, and four equidistant dots…
Metal-work
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