5. MEASURING FOR LENGTH (RULE AND PENCIL). FIG. 7.
Hold the back edge of
the rule in the left hand and place it on the tool rest so that the
front edge is almost in contact with the revolving cylinder.
With a sharp pencil mark off the required length, starting from the dead center end. The first mark should be just far enough in on the cylinder to insure cutting past the point of the dead center. This will leave all surplus stock at the live center end where it is needed, because, if not enough stock is left at this end, there is danger of striking the live center spur with the tool and of injuring the chisel and perhaps the work.
In case several measurements are to be made, as in some of the following exercises, the rule should not be moved until all are marked. This will insure more accurate work than if the rule be changed several times.