. A treatise on artificial limbs with rubber hands and feet ... to show how the entire worlddraws upon their factory for artificial limbs. The leg with restricted back and forward ankle motion was con-structed by Mr. A. A. Marks during the interim 1853-1863. The jointincluded a spring adjustable for tension and provided compensation forwear. The experience of ten years showed that the ingenious audmuch praised ankle joint was too weak for hard service, and repairs A. A. MARKS, ARTIFICIAL LIMBS, NEW YORK CITY. 363 were very frequently required. A patient applied to Mr. Marks for anew foot witho
. A treatise on artificial limbs with rubber hands and feet ... to show how the entire worlddraws upon their factory for artificial limbs. The leg with restricted back and forward ankle motion was con-structed by Mr. A. A. Marks during the interim 1853-1863. The jointincluded a spring adjustable for tension and provided compensation forwear. The experience of ten years showed that the ingenious audmuch praised ankle joint was too weak for hard service, and repairs A. A. MARKS, ARTIFICIAL LIMBS, NEW YORK CITY. 363 were very frequently required. A patient applied to Mr. Marks for anew foot without ankle joint. The idea, opposed to preconceivednotions, was carried out with some difficulty, and the problem waspractically solved. Now, except in very special cases, the ankle jointis definitely abandoned, and the India rubber foot, the result of a vastnumber of experiments, patented and controlled by this firm isemployed. The first step in the process of leg making is the cutting of the timber,iwo kinds of wood are used-the willow and the bass. These are. The capacity represents an output larger than the aggregate of any other ten ArtificialLimb Factories in the world.— Scientific American. No. 1198. felled with saws, are cut into short lengths, and an auger is driventhrough each log. The wood is kiln dried in live steam at a pressureof eighty pounds to the square inch. The endeavor in boring out theaxis of the log is to provide for internal contraction, thus preventingchecking. Several years seasoning are given. The seasoned wood, which has been roughed out with a buzz saw, isreceived in the factory and is ready for the workman. Fig. 6, g, Cut , shows a log prepared for the shaping process. The workman hasto give the interior a shape representing the contour of the stumpon w-hich the shape is based. With peculiar carving tools theinterior is rapidly excavated until the approximate shape is guide or template for the interior, two pasteboard profiles (Fi
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