PATTERN 6.
This is merely a circle of shells, worked the same as in pattern 1; only with this difference, that each circle is done to correspond in each shell, instead of working every one separately, which would be more tedious; 15 is counted on the eccentric chuck wheel for each row of circles. The rays in the middle are done with the drill; these can also be done without an eccentric chuck; the numbers must then be counted on the fly-wheel, which, for this kind of line work, is kept steady with the stop.
PATTERN 1, [PLATE 12.]
Cut a small circle, then one every 12 numbers on the eccentric chuck wheel. Move the chuck downwards two turns, and the eccentric chuck wheel 1 number, either backwards or forwards; if the former, the rows of circles will incline to the right; if the latter, to the left. Proceed the same for every row of circles, always counting twelve between each, and advancing the chuck 1 number at the beginning of every new row.