Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 20
Fig 7 figuring, laying out, etc., a long conical point should be used.A 2 H pencil will be found satisfactory. For the drawing itself,one 4 H pencil and one 6 H pencil, carefully sharpened, are needed.After removing the wood. Fig. 4, the lead is made slightly conical,Fig. 5, and then formed as in… … start Here^ rig. 11
Mechanical drawing
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