. 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. 837. FOUR-SPOOL HOISTING type. Friction drums with stop ratchetand pawl and friction-brake straps. Independ-ent clutch winches. All under control of fourhand levers and two foot levers. A most convenient type of com-bination hoist where a great vari-ety o
. 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. 837. FOUR-SPOOL HOISTING type. Friction drums with stop ratchetand pawl and friction-brake straps. Independ-ent clutch winches. All under control of fourhand levers and two foot levers. A most convenient type of com-bination hoist where a great vari-ety of work is in progress. Thetwo drums and four spools haveeach an independent motion andstop. 838. DISINTEGRATOR. Blanchard type. On two concentricshafts driven at high speeds are mounted grids or cages, one within the other, driven in oppositedirections. F, the feedhopper. E, a steel pinprojecting within the in-ner cage to receive theimpact of the coarse ma-terial. A, the outer cagedisk frame. C, innercage disk frame. B,casing. D, D, B, journalboxes. Velocity of the periphery of the cages about 6,000 feet perminute. 325. 326 ENGINEERING AND CONSTRUCTION, ETC. Slates
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