Jamison, Alpha Pierce. [from old catalog] · New York, J. Wiley & sons; · leaf 124
work, such as free-hand lettering,dimensioning, etc. To fashion the needle-point, begin at apoint about ij from the end, and with a sharp knife bring it(the pencil end) to a neat and true cone, from the apex of whichthe lead projects about J; now bring the lead to a uniformlytapered needle-point,…
Mechanical drawing
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