. Machinery and processes of the industrial arts, and apparatus of the exact sciences. becomes too great to continue with fifteen-toothed pinion is brought into gear with the wheel E, andthe crank transferred to its axis. This combination gives one turn ofthe nut to eighty-one turns of the crank. Afterwards the fifteenTtoothedpinion is thrown out of gear and the nine-toothed pinion thrown gives a turn of the nut to one hundred and thirty-six and a halfof the crank, and is the largest multiplication of force of which themachine admits. With this combination a man, by applying t
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. becomes too great to continue with fifteen-toothed pinion is brought into gear with the wheel E, andthe crank transferred to its axis. This combination gives one turn ofthe nut to eighty-one turns of the crank. Afterwards the fifteenTtoothedpinion is thrown out of gear and the nine-toothed pinion thrown gives a turn of the nut to one hundred and thirty-six and a halfof the crank, and is the largest multiplication of force of which themachine admits. With this combination a man, by applying to thecrank a force of fifteen kilograms, or about thirty-two pounds, can exerta pressure of nearly fifty tons on the entire surface of the body com-pressed. This press, for its neatness, compactness, and strength, isworthy of high commendation. samains knee-joint press. One other only of these mechanical presses will be noticed, and tbatfor its peculiarity of employing the principle of the knee-joint for highcompression combined with pretty large movement. The knee-joint Fisr. Samains Knee-joint Press. press is recommended by several advantages. It acts spontaneously toincrease the intensity of the pressure, when by the reduction of vol 217 nine of the mass compressed the resistance becomes greater 5 and as thelimit of the movement is approached, the ratio of the power to the resist-ance becomes mathematically unlimited. The construction is simple,and the loss of useful effect by friction is less than in the presses whichact through gear-wheels. On the other hand, in a press of this descrip-tion a large range of movement cannot be obtained without giving tothe machine much greater dimensions than are necessary in ordinarypresses of equal power. The press represented in the annexed figurewas exhibited by Mr. P. Samain, of Blois, France. It is constructed ofseveral sizes, furnishing an actual pressure of from twenty to one hun-dred tons. The smallest is about seven feet, and
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
