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 181
theoutside of the hole should be described on the metal with thedividers, and four equidistant dots slightly punched. Thedrill should now be allowed to just enter the work, and thenbe withdrawn to check the centre with the four dots. If thedrill has run out of the centre, the hole must be drawn… … Pan. Countersunk. Fig. 150.—Forms of Rivet Heads. they may revolve. Four different t3rpes of rivet heads,shown at Fig. 150, are in common use, but the snap andcountersunk are mostly used in the handicraft-room. The snap head is nearly a hemisphere in form, the diameterof the head^being slightly…
Metal-work
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