. 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. ar wheel tothe knucklesheaves, and per-mit of additionalroom at the top. This front wheel has one or more grooves, dependingupon the number of cars to the trip and the amount of material to behauled, and has always one less groove than the larger or rear wheel, theshe
. 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. ar wheel tothe knucklesheaves, and per-mit of additionalroom at the top. This front wheel has one or more grooves, dependingupon the number of cars to the trip and the amount of material to behauled, and has always one less groove than the larger or rear wheel, thesheaves being placed tandem. The rear wheel is made with two or moregrooves, to allow the rope to be placed on the sheaves in the form of afigure 8, thus securing considerable contact of the rope on both wheels. The depth of the grooves in each wheel should be exactly the same, avariation of a small fraction of an inch being detrimental to the life ofboth rope and sheaves, as if the wheels are not made correctly, the ropepassing around them must slip or stretch with each revolution of thewheels. The brake bands are either lined with cast-iron shoes or maple blocksplaced on end, the latter method being usually preferred. Each brakeis also provided with a large screw and nuts to take up wear. 282 MINING DEVICES AND 733. BRIQUETING MACHINE. Eggette type. Two large rolls having indentations ontheir face to correspondwith a half-egg shapeand made to register,revolve under a close-fitting hopper ; the eg-gettes drop from beneaththe rolls upon a con-veyor belt, or to a binthrough a chute. 734. A BRIQUETING PLANT. A main driving shaft over-head drives by belts, the ore dust mixer, lime tank mixer, briqueting ma-chine, and conveyorbelts. The materialused for cementing thebriquets varies great-ly with the kind ofmaterial to be bri-queted. For ores,lime is in general fuels, coal tar,resin, pitch, clay, and lignite for anthracite culm. For bituminous culm, lime, clay, and
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