. 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. 887. CONICAL CHARCOAL round on a clay floor with brick walls12 inches thick for 7^ feet. Eight-inch wallto top. About 90 vent pipes built into thewall in 3 rows with stoppers. Size of a35-cord kiln, 28 feet inside at bottom ; 28 feethigh. A, sheet-iron door
. 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. 887. CONICAL CHARCOAL round on a clay floor with brick walls12 inches thick for 7^ feet. Eight-inch wallto top. About 90 vent pipes built into thewall in 3 rows with stoppers. Size of a35-cord kiln, 28 feet inside at bottom ; 28 feethigh. A, sheet-iron doors and cast-ironframes, 6x6 feet, or bricked up with of burning 9 to 10 days ; at 5 daysvents are plugged tight. Productof 35cords,1,700 bushels. Thirty-five thousand brickare required to construct it. 888. Ground plan of the charcoal kiln. MISCELLANEOUS DEVICES. 347. 889. COKING OVEN. Connellsville type. The type now in gen-eral use has a diameter of from 10 to 12 feet, and a height of from 6 to 8 feet, and is built of fire brick orstone. It is arched in the interior, andhas an opening in the top for chargingand for the escape of the gases during thecoking process, and a door in the lowerfront side through which the finishedproduct is drawn, this door being closedduring the coking process. The averagecharge of coal per oven is from three andone-half to four tons, the heavier charge re-quiring more time for the coking the charge is leveled it has a depthof from two and one-half to three feet inthe oven, thus leaving sufiicient room forthe accumulating gas and for the expan-sion and rising of the coke during theprocess of its manufacture. It is thepractice to charge every other oven eachday, and the charge is ignited by the heat retained in the walls of theovens. The ignition is indicated by a puff something like a powderexplosion. For
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
