Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 29
ead between the Nibs. milled head placed between the nibs of the pen, as in Fig. 24, andthese are adjusted by right and left-hand threads on the screw ofwhich the milled head forms part. Some ruling pens are madewith the ivory handle to unscrew and serve as a pricker or stationpointer. This form…
Mechanical drawing
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