n: Fig. 20.]

[Illustration: Fig. 21.]

[Illustration: Fig. 22.
The above illustrations represent various Deformities cured by our
Specialists
at the Invalids' Hotel and Surgical Institute.]

* * * * *

MECHANICAL AIDS

IN THE TREATMENTS OF

CHRONIC DISEASES.

We have, in different parts of this work, referred to a large variety of
ingeniously devised machinery and apparatus employed at the Invalids'
Hotel and Surgical Institute, in the treatment of chronic diseases.
Although we can, on paper, give but a meagre idea of the variety and
adaptability of these valuable mechanical appliances, yet we will
endeavor to illustrate and explain a few of our machines for the
application of transmitted motion.

[Illustration: Fig. 1.
The Manipulator. ]

Fig. 1 represents a machine, called the Manipulator, which transmits
motion through suitable attachments, which are adjustable by means of
the ratchet _G_, so as to reach all parts of the body. It is equally
available for applying motion to the head, feet, or any intermediate
part of the body.

_B, B_ are rubbing attachments, with two opposing elastic, adherent
surfaces, between which an arm or a leg may be included. These have
alternate reciprocating action from the rock-shaft _H_, and are made to
approach each other, and press the included part at the will of the
patient. This is sometimes called the double-rubber, and is made
detachable if desired.

_A_ is the lever, by which the two parts of the double-rubber are made
to compress the arm or leg.

[Illustration: Fig. 2.
Manipulator Extended.]

[Illustration: Fig. 3.
Manipulator Folded.]

_D_ is a single attachment for rubbing. It may be connected at either
side of the machine, so as to present the rubbing surface in four
different directions, as may be most convenient. It will act
perpendicularly, horizontally, or diagonally, and from below or from
above the part receiving the action, according to requirements. The
shank of the rubber may have any special form to suit special cases.

_C_ is the _foot holder._ It communicates to the leg the semi-rotary or
oscillating motion of the rock-shaft. It may be attached to either end
of the rock-shaft.

_E_ is the _hand holder,_ which, grasped by the hand, communicates
motion to the arm, shoulder, and chest; or the hand may be inserted
passively, when the effect of motion is more confined to the hand and
fore-arm.

In the