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104 INSTRUMENTS FOR FILLING.

of augmenting its power, or, especially, of bringing it
to bear upon points inaccessible to the straight in-
strument. Some of these stocks are very compli-
as, for example, that denominated Chevaliers
cated ;
Fig. 16.

drill-stock, than which there are none better adapted
for bringing the drill to bear in various directions.
(Fig. 16.) Another, more simple in construction,
called Merry s drill-stock, was some years ago intro-
duced to the notice of the profession. With this,
the drill can be applied at any desired angle, the

operator having almost as complete control of the in-
strument as of the common straight drill. (Fig. 17.)

Fig. 17.

Broaches.—The broaches of three or four sides are
made of the best steel, and are of various sizes.-

They are constructed both of a straight and of a ta-
pered form. They should in no case have more than