tion with the line A B, we lay off thirtydegrees, as in former drawings, and through the points so establishedon the arc a a we draw the radial lines A b and A c. From theintersection of the radial line A b with the arc a we draw the lineh h at right angles to A b. Where the line h intersects the… … <*< /« Fig. 20 the dividers, and on the arc a a lay off the said two and a halfdegrees to the left of this intersection, and through the point soestablished draw the radial line A g. From 5asa center we sweepthe arc d d so it passes through the point of intersection of the arc awith the line…
Clocks and watches
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