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Elements of mechanical drawing (1911)

Jamison, Alpha Pierce. [from old catalog] · New York, J. Wiley & sons; · leaf 110

An illustration from Elements of mechanical drawing, 1911, leaf 110 — l-point mustalways be adjusted to the center-point. . The remarks on the ruling-penapply also to the pen of the pen-leg;the pencil-point will be treated of inthe discussion of lead-pencils andleads. Needle P°int The accuracy of the construction jrIG of the tool may be remarked by closing the… … screw 92 MECHANICAL DRAWING. ment be broken at the knees (to the same degree) and the pointsbrought together, they should coincide. To use the compass, the points should be brought to theproper adjustment and the instrument broken at the knees—each knee to the same degree—until the legs of the tool…

Mechanical drawing

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