Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 72
ING CIBOULAE LINES. 69 arch, but occurs often in the Decorated Period, towards the endof the fourteenth century. After that period the arches weremade flatter, examples of w^hich are the segmental, or tw^o-centred,and the Tudor, or four-centred, arches. This ink-leg of the compasses works very… … Method of using the Pump. between the right thumb and fingers, and use the left hand onlyto steady the point at starting by resting the fingers on the paper.Never use two hands to the compasses. The smaller curves arenot easy to put in with large compasses—a bow pen (Fig. 39, p. 31)or small compass…
Mechanical drawing
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