This 'web version' uses Optical Character Recognition (OCR), to interpret the original printed copy and convert it to computer-readable text. This technology can result in text errors.
Of the many types of wonderful mechanical arms and legs now on the market, three of the most interesting are here illustrated-the Rowley leg, the Hanger leg, and the Carne arm. The latter is shown in use by a representative of the Carnme Artificial Limb Company, of Kansas City. Modern artificial limbs are made of light wood, preferably English willow, the parts between the joints being hollowed out to contain the operating mechanism and the cords and levers connecting it with harness worn round the neck and shoulders.
Any given motion of the shoulder-muscles causes some definite movement in the artificial limb. In the Carne arm the elbow is bent by a pull on the cord. At the wrist is a system of bevel wheels and ratchets by means of which the hand can be revolved at the wrist by pulling a cord. The pulling of another cord closes the fingers. The Hanger leg has a thigh portion and a leg portion con- nected by a knee hinge. The bending of the knee is effected by a lever pivoted in the thigh portion and connected with an elastic spring inside the calf. The Hanger foot has a central ankle pivot and a rubber cushion under the heel and instep.