Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 43
itepaper. Next, keeping the pen per-pendicular to the surface of a flat,close-grained oilstone, move backand forth until the nibs are square and of equal length. The nibs arethen rounded to a radius of onethirty-second of an inch by ruling aline on the oilstone and continuallychanging the… … Fig. 21.—Rounding the Nibs ofthe Pen. DRAWING INSTRUMENTS AND MATERIALS 23 must be taken that the rounded shape of the end is not altered;also a wire edge must not be produced, as this will cut thesurface of the paper or tracing cloth. To test the condition of the pen, clean it thoroughly and drawa…
Mechanical drawing
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