Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 33
drawing-paper, and admit of greater accuracy intlieir use. 30 PBAGTICAL DBAUGHTSMENS WORK. Hair dividers are useful for comparing or setting off smalldistances with great accuracy, though with care an equal amountof accuracy can be obtained with the ordinary dividers. Hairdividers have one leg… … Fig. 34.—Leg of Hair Dividers. Proportional compasses are specially for the purposes of reduc-tion and enlargement. From Fig. 35 it will be seen that the twoarms of the compasses are slotted to receive the sliding blockswhich form the pivot. By means of the milled head shown in thefigure, this…
Mechanical drawing
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