. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 768. ANGLE IRON BENDING MA-CHINE. For the shape shown the top rolleris flat ; the rear under roller is grooved to fitthe flange of the angle iron. The front rolleris also grooved and is set up for the desiredcurve by a sliding frame and capstan screw. 769. ROLLED-THRE
. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 768. ANGLE IRON BENDING MA-CHINE. For the shape shown the top rolleris flat ; the rear under roller is grooved to fitthe flange of the angle iron. The front rolleris also grooved and is set up for the desiredcurve by a sliding frame and capstan screw. 769. ROLLED-THREAD-SCREW MACHINE. The cut shows the principle of the rolling of ^-inch diameter and less are made with four rollers and arerolled cold. For screws larger thanJ inch three rollers are used andthe screws rolled hot. 770. Sample of rolled 771. POWER HACK-SAW. One of the handy specialties of a shop. Automatic-ally cuts off steel bars up to 4-inch and requires no attention whilecutting. MILL AND FACTORY APPLIANCES AND TOOLS, ETC. 295 772. SEAMLESS TUBE MACHINE. Mannesmanns principles in this process of making tubing from solid bars of metal are, that solid barsrolled between apair of conicalfluted rollers, set atan angle, as at A,a, draw the metalfrom the center ofthe bar to the out-side. The revolv-ing mandril andcone, D,M, smoothsthe inside of theexpanding is the guide tube and frame and B the metal bar. 773. Elevation, showing angle of rollers. 774 and 775. Plan and elevation of gear for rotating the mandriland cone.
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