Pages 25, 26, 55, 56, 82, 83, 105, 110, 111, 139, 140, 168, 196, 221, 222, 223, 254, 282, 310, 311, PIERCE, FLORIAN W. "Pole Dolleys" POEMS Are You Wild? . Homespun Yarn "Send It In" Telling Time To Uncle Sam .Cottrell's Magazine 21 330 Selected 104 275 Promote Safety by Preventing Accidents-What You Can Do To Help 40 RYAN, WILLIAM A. A Supplementary Statement Relative to Purification of Boiler Feed Water at Station 3. 318 98 The Purification of Boiler Feed Water at Station 3 296 Opportunities Offered to the Chemical Industry in the Manufacture of Gas The Gas Situation in Our Company and the Necessity for the New Rate Company Service to Main Office and Camera Works of Eastman Kodak Co.. WOODHEAD, ALBERT H. 57 257 113 233 323 69 291 179 15 259 127 182 223 255 283 311 339 319 315 112 283 Vol. 8 GAS AND ELECTRIC NEWS JULY, 1920 No. 1 Electric Brass Melting EDWARD A. ROESER THE HE success attending the adaptation of the electric arc furnace to the steel industry attracted the serious attention of those most interested in the problem of melting non-ferreous alloys. No radical improvements had been introduced in the art of melting such alloys for decades and the application of electricity was retarded largely because of failure to fully appreciate the benefits derived from its use as well as the economic factors which have served as a deterrent. The war changed many of these factors and called for conservation of natural resources. An incentive was thereby established for a consideration of more efficient means of utilizing electrical energy. Experiment and practise soon proved that a satisfactory heating medium must be free from the metal bath itself and the heat must be uniformly distributed at such intensity as to prevent hot spots with inevitable and wasteful volatilization of the constituent metals which have low boiling points. With these factors established as fundamentals much progress was made in the design of equipment likely to approximate ideal conditions. There are now some five or six types in practical use giving reasonably satisfactory results. Opinion in this respect is not unanimous as might be expected but it may safely be said that each type has a field of application providing the conditions are favorable. It is therefore evident that each particular alloy and means for melting it most efficiently must receive special attention from a metallurgical as well as an electrical engineering viewpoint or an expensive choice is likely to be made. Many of the mistakes due to failure to recognize these elements are now happily past experiences or soon will be. FACTORS INFLUENCING USE OF ELECTRICITY FOR BRASS MELTING Among the factors that contributed to the recent intensive development of non-ferreous metal melting furn aces are: (A) Reduction of metal loss (D) Rate of production proved working conditions. (A) One of the chief difficulties in the melting of alloys is the metal loss sustained due to the volatilization of constituent metals, particularly zinc. The absorption of deleterious gases and elements, such as oxygen and sulphur constitute another factor. A closed chamber free from contaminating influences enables the metal |