table, as shown in Fig. 195, a circle, I and J. We now take a scribing block, and, settingthe point just to intersect the extreme diameter in each case,we draw the lines, E and L, M and N, and O and P, thusdefining the widths and thicknesses of the jaws and hubs.We then set the scriber point even… … FwM. and blocking it up so that it lays level with the face of themarking-off table, and with the face that has been markedoff uppermost, we insert between the jaws the center piece,B. We next mark from the center, C, the requisite distanceof the crown of the curve, between the jaws, thus…
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