Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 20
iangle can also be used for drawing hexagon boltheads and nuts, for dividing a circle into six or twelveequal parts, while the 45° triangle will serve for squarebolt heads or nuts and for dividing a circle into four oreight equal parts. See Figs, i and 2. They can also be used for drawing parallel… … Fig. I. Fig. 2. Hold triangle A firmly with the left hand and slidetriangle B along in either direftion, holding it firmlyagainst A, to the point through which the line is to bedrawn. ,^ The Pencil should be sharp-ened at both ends, the leadquite long, and brought to afine round point at one end…
Mechanical drawing
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