The trouble which would ensue from not providing for such extra end
shake would be that the lower edge of the half shell, shown at _e_, Fig.
171, would strike the projection on which the "stalk" of the tooth is
planted. After the lower pivot is turned to fit the jewel the cylinder
is to be removed from the cement chuck and the upper part turned. The
measurements to be looked to now are, first, the entire length of the
cylinder, which is understood to be the entire distance between the
inner faces of the two end stones, and corresponds to the distance
between the lines _v d_, Fig. 171. This measurement can be got by
removing both end stones and taking the distance with a Boley gage or a
douzieme caliper.
A CONVENIENT TOOL FOR LENGTH MEASUREMENT.
[Illustration: Fig. 180]
A pair of common pinion calipers slightly modified makes as good a pair
of calipers for length measurement as one can desire. This instrument is
made by inserting a small screw in one of the blades--the head on the
inner side, as shown at _f_, Fig.
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