tter and must makethe wheel, we must draw it on the brass by hand with a fineneedle point before proceeding to saw it out by hand, Fig.35. Say that the wheel is to have thirty-two teeth, whichis a common number; then 360° -^ 32 ^ ii^° as the spacebetween the points of our teeth. Take a large… … Fig. 35. Drawing an escape wheel to cut. The last drawing shows thecomplete wheel. THE MODERN CLOCK. I23 point, at the edge of the protractor. Then take a straightedge and draw a radius from the center to the circumfer-ence ; change the straight edge to the other mark and markthe point where it…
Clocks and watches
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