forth. each other. having a suitable screw thread cut on it and a short spiral groove terminating In a radical cutting point on the end of the auger and a while the cutter on the end of the cylindrical screw portion serves to cut a hole corresponding in diameter to their enlargement through cording to the distance the cuttiL end is set from the axis of mu. for producing tension on the thread of a lever D. through or in con dency to irregularity in the friction is counteracted by the consequent irregularity of the draft of the thread upon the said lever substan with the double gears above
forth. each other. having a suitable screw thread cut on it and a short spiral groove terminating In a radical cutting point on the end of the auger and a while the cutter on the end of the cylindrical screw portion serves to cut a hole corresponding in diameter to their enlargement through cording to the distance the cuttiL end is set from the axis of mu. for producing tension on the thread of a lever D. through or in con dency to irregularity in the friction is counteracted by the consequent irregularity of the draft of the thread upon the said lever substan with the double gears above claimed substantially as described for foot pieces D substantially as described. nection tubes c c the furnace d the smoke or heat chamber e and parts or their equivalents are constructed and , scientific american, 1860-04-28
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