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THE MALLET. 173

the control of the operator, various forms of automatic
mallet pluggers have been invented and constructed.
Two or three principles embrace the whole, though
perhaps twenty different forms have been made. Those
operated by the action of spiral springs have been the

more common ; the objection to almost all of these is,
that the stroke lacks the desired elasticity. This
class of instruments is represented in general aspect,
by Fig. 44.

Fig. 44.

This instrument was invented by Dr. I. A. Sal-

mon, and is one of the best of this form ; and operates
well in the hands of those who become familiar
with it.
Another form of mallet plugger is represented in
Fig. 45, in which the blow is communicated by a
spring of another form, and of such an arrangement
as to give a springing stroke. This instrument was in-
vented and made by Dr. W. Gr. Redman. It would be
objectionable in the hands of some, because of its size,
weight and form : use and custom will remove great

apparent, and even real, difficulties.
Both of these instruments are less under the control
of the operator, in respect to the force of the blow,