Mechanical drawing for plumbers; a concise, comprehensive and practical treatise on the subject of mechanical drawing (1910)
Starbuck, R. M. (Robert Macy), 1844-1927 · New York, The Norman W. Henley publishing co. · leaf 51
nn … o Fka.54. square. No. 2 is called a bow pen, andis used in making small and mediumsized circles. No. 3 is an attachment usedin inking large circles. As shown, it ismade with a joint and is designed to slipinto the large compasses shown in ourfirst chapter, taking the place of the pejcil attachment.…
Plumbing · Mechanical drawing
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