The chief use of such an angle-measuring device is to
aid in comparing the relative action of the several parts with a known
standard.
[Illustration: Fig. 71]
For use with full-plate movements about the best plan is a spring clip
or clasp to embrace the pallet staff below the pallets. We show at Fig.
71 such a device. To make it, take a rather large size of sewing
needle--the kind known as a milliner's needle is about the best. The
diameter of the needle should be about No. 2, so that at _b_ we can
drill and put in a small screw. It is important that the whole affair
should be very light. The length of the needle should be about 1-5/8",
in order that from the notch _a_ to the end of the needle _A'_ should be
11/2". The needle should be annealed and flattened a little, to give a
pretty good grasp to the notch _a_ on the pallet staff.
Good judgment is important in making this clamp, as it is nearly
impossible to give exact measurements. About 1/40" in width when seen in
the direction of the arrow _j_ will be found to be about the right
width.
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