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 176
d, should when verticalremain stationary at any point in a hole which was drilled byit; not even its own weight should force it to drop through. The pin drill (Fig. 138) is used for recessing holes toaccommodate cheese-head screws, bolt-heads, etc. The ]Dinon the drill should be of the same…
Metal-work
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