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THE FILE. 121

are preferable for all operations on the teeth; and
the more oblique are to be recommended, since they
cause less of that jarring unpleasant sensation to the
patient.
There are in use various forms of file-carriers, two
of which are represented in Figs. 38 and 39. Fig.

Fig. 38.

Fig. 39.

39, denominated " Redman's file-carrier," is the best

form yet introduced ; one principal advantage of this
instrument, consists in the facility with which it may

be changed from the one side to the other. Files
are made adapted to the instrument. The chief
advantage of which is, that they retain the file much
more firmly than it can be held in the fingers.