. 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. 784. MELTING FURNACE for brass,copper, or bronze. Operated by gas orcrude oil, and compressed air. Oil or gas is fed through the small pipe,atomized and mixed with air in the inletnozzles at the top of the cupola and the flameprojected down upon the metal. The cupolai
. 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. 784. MELTING FURNACE for brass,copper, or bronze. Operated by gas orcrude oil, and compressed air. Oil or gas is fed through the small pipe,atomized and mixed with air in the inletnozzles at the top of the cupola and the flameprojected down upon the metal. The cupolais tipped by the wheel and gear to pour themetal from the side spout. 298 MILL AND FACTOR i APPLIANCES AND TOOLS, , 785. DUPLEX MELTIiN.; FURNACE. Rockwell type. Nocrucibles are used, the furnace chambers being lined with refractory material which is inexpensive and cheaplyapplied, and the charges of metal to be meltedbeing placed in the chamber, as in the right-hand chamber, 786. The fuel used is oil or gas,the air being supplied by an ordinary fan orpressure blower and there being a burner ateach outer trunnion. But one of these burnersis normally in operation at a time, the flamewhich is melting one charge extending into theother chamber and giving up much of its re-maining heat to the fresher charge of metal. When the charge in either chamber is com-pletely melted itis passed out byturning the cham-ber and bringingthe mouth downto the pouring po-sition. The twochambers may beused for differentmetals or for thesame metal, and both charges may be melted so as to be poured to-gether if a large quantity of metal is required at once. The halves ofthe chambers are hinged so as to make the entire in
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