Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 35
MENS WORK. in sets of three, comprising dividers, pen bow and pencil bow. Aset is illustrated by Figs. 37, 38, and 39. A form of spring bow which is known as the pump pen isshown in Fig. 40. In this, one leg consists of a straight rod about4 in. long. The pen or pencil forms the other leg, which…
Mechanical drawing
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