Jamison, Alpha Pierce. [from old catalog] · New York, J. Wiley & sons; · leaf 108
that cannot be treated with an oil-stone or oil-slip, theymay be removed by the use of very fine emery-cloth. To try the pen, secure a piece of drawing paper and a straight-edge, and having thoroughly wiped all oil and dirt from the nibs,screw them together until about TV to ^n apart, and charge…
Mechanical drawing
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