In addition to the diameters named, we must get
the proper height for the balance, which is represented by the dotted
line _b_. The measurement for this can usually be obtained from the old
cylinder by simply comparing it with the new one as it rests in the
cement chuck. The true tool for such measurements is a height gage. We
have made no mention of finishing and polishing the pivots, as these
points are generally well understood by the trade.
REMOVING THE LATHE CEMENT.
One point perhaps we might well say a few words on, and this is in
regard to removing the lathe cement. Such cement is usually removed by
boiling in a copper dish with alcohol. But there are several objections
to the practice. In the first place, it wastes a good deal of alcohol,
and also leaves the work stained. We can accomplish this operation
quicker, and save alcohol, by putting the cylinder with the wax on it in
a very small homeopathic bottle and corking it tight. The bottle is then
boiled in water, and in a few seconds the shellac is dissolved away.
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