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(540) Electric Furnaces and Ovens Part VI, 1930-31 Mechanical Catalog GENERAL ELECTRIC COMPANY General Office: SCHENECTADY, N. Y, Manufacturer of Complete Electrical Power Equipment and Supplies BRANCH OFFICES: See page 13 G-E DIRECT HEAT ELECTRIC FURNAC_ A complete line of furnaces for steel harden ing, drawing, annealing and carburizing; a new continuous AIR-SEALED vitreous enameling furnace; furnaces for tinning and galvanizing; brass and copper annealing, white-metal melting; and completely erected furnaces for all kinds of heat treating and processing are now available. Many of these designs are the result of years of experience with electric furnaces in G-E factories. means, and it permits complicated structures to be made from simple parts at a considerable saving in cost. STANDARD FURNACES: For general heat-treating, tool room installations, small shops, etc., a line of standard furnaces has been developed, hundreds of which are in daily use. They include box type, with hearth widths from 12 inches to 36 inches, vertical, cylindrical, pot type Standard G-E Direct Heat Electric Furnaces Electric Resistance Furnaces for Heat Treating Temperatures up to 1850 F. can be maintained con tinuously without deterioration of the non-oxidizing nickel-chromium alloy ribbon resistor. Automatic temperature control insures accurate, uniform tem peratures without over-heating and with minimum power consumption. for lead and cyanide hardening, and melting pots for lead, tin, solder and babbitt, which use the direct heat principle of immersing a helicoil sheath wire cast-in unit directly in the metal to be melted. Stocks of these furnaces are always maintained. These furnaces are arranged for either alternating or direct current and operate on standard circuit voltages. COPPER BRAZING IN ELECTRIC FURNACES: Copper brazing in an atmosphere of protective gas is a process developed in the G-E Research Laboratory The design of heating units provides an even dis tribution of heat throughout the furnace chamber without hot or cold spots. for use on G-E products. Turbine parts, molds, dies, refrigerator units and many other parts are being successfully joined. This process is a convenient method of uniting parts by a strong alloy weld, which would be exceedingly difficult to accomplish by other G-E AIR DRAWING OVEN: The proper drawing of tools, dies, and other steel parts after hardening is an important step in their production. Perfect uniformity in heating, with close control of temperature is essential to secure high qual ity. The electrically heated, automatically controlled oven is ideal for this work because it fulfills the requirements to a degree impossible of attainment with a fuel heated oven, and insures exact duplication of re sults as often as may be de sired. The steel comes out clean, the temper is uniform through out, and where surface color is desired, the right shade is as sured. These are the results of uniform heating in a clean at mosphere at temperatures main tained automatically within plus Continuous Electric Furnace for Copper Brazing Evaporator Parts Or minus 5 degrees. (See pages 13, 480, 597 608, 796 and 797 for additional products ofthis Company) Type AD Air Drawing Oven (608) Air and Gas Compressors Part VIII. 1930-31 Mechanical Catalog GENERAL ELECTRIC COMPANY General Office: SCHENECTADY, N. Y. Manufacturer of Complete Electrical Power Equipment and Supplies BRANCH OFFICES: See page 13 G-E AIR COMPRESSORS: energy imparted to the air by the high peripheral The G-E center gear type motor driven air compressors were made for supplying com pressed air for operation of brakes, whistles, and other pneumatic devices. Type CP compressors are for use on direct-cur speed of the impeller instead of dissipating such energy in heat. Owing to the absence of valves and rubbing surfaces there is no possibility of leak age with the subsequent decrease of efficiency that characterizes all forms of positive pressure blowers. rent circuits. Type CPT compressors are for use on three-phase alternating-current circuits. Type CPQ are for use on two-phase circuits. 1TM Type CP .and CPT-27 and 28 direct- current and alternating-current sets, respec tively, are furnished with three-wheel trucks, 6 ft. 9 in. long, 2 ft. S in. wide and 3 ft. 9 in. high, complete with con trol, reservoir (18 x 60 in.), 25-ft. rubber hose . with nozzle, safety valve, stop-cock, coupler socket mounted on truck and coupler plug, all piped and wired ready for operation. Types CP and CPT- Portable Air Compressor Outfit 26, 100 to 110 cu. ft., direct-current and alter nating-current sets, can also be furnished mounted on mine type car complete with control and all accessories. Turbine Driven Centrifugal Gas Ex hauster for 10,000 Cu. Ft. of Gas per Min. against 354-Lb. Pressure Centrifugal Compressors are usually driven by steam turbines which are now available as high efficiency, high speed units or electric motors of the variable and con stant speed type. Where higher speeds than are available from direct-connected drivers are necessary, speed-increasing gears are interposed between them and the compressors, thus permitting of greatly ex tended capacity. The use of high' speed drivers with either direct-connected or with speed-increasing gears results in high over-all efficiencies, low up-keep cost, small space occupied, ab sence of noise and vibration. These CENTRIFUGAL COMPRESSORS: features, together with the greater dura bility, low maintenance and extreme Centrifugal Compressors are built in single and multi simplicity, are stage types. ' worthy of the The single stage compressor consists of a rotating consideration of impeller mounted on the shaft of the driver and sur the engineer. rounded at its periphery by diffuser rings. These are General Elec enclosed in a circular casing somewhat similar to that tric centrifugal air of a centrifugal pump. The intake is located at the compressors are end center while the discharge may be located in any one of eight positions about the circumference of the circular casing. The multi-stage centrifugal compressor consists operated success fully in the follow ing applications. Oil-fired fur Motor Driven Single Stage Compressor for 3000 Cubic Feet of Air at 9-lb. Pressure with Speed-Increasing Driven by 170 HP Induction Motor Gear simply of two or more impellers and diffusers in series. naces, gas-fired furnaces, pulverized coal-fired furnaces, Each stage is separated by a suitable diaphragm which agitation of liquids, cupola blast, pneumatic conveying, efficiently directs the air or gas from one stage to the water gas generators, blast furnaces, Bessemer con next. Diaphragms are provided with suitable inter verters, copper blast furnaces, copper converters, gas stage packings and where these machines exhausting, and gas boosting. are used to handle gas suitable packing These units are manufactured in capacities up to is provided on each end where the shaft 85,000 cu. ft. of free air per minute against 35 lbs. pres enters the casing. Tar drains are also sure, and may be driven by either motors or turbines. provided on these units for gas service. For complete information on these outfits refer to One of the striking features of cen our nearest Sales Office. trifugal compressors is the high efficiency which they are capable of maintaining for years without renewals or appreciable expense for maintenance. This high efficiency is due to the fact that unlike the ordinary fan or blower they are capable of recovering in the form of pressure nearly all the velocity Turbine Driven 50,000 Cu. Ft. Blast Furnace Blowers (See pages 13. 480, 540, 507, 796 and 797 for additional products of this Company) Mechanical Catalog Consisting of uniformly presented and illustrated catalog information, conveniently classified, describing the products of manufacturers of mechanical equipment 'With DIRECTORY OF MANUFACTURERS OF INDUSTRIAL EQUIPMENT, MATERIALS AND SUPPLIES A specialized, .classified and cross-indexed list. with names and addresses inserted free of charge 1930-31 TWENTIETH ANNUAL VOLUME ISSUED OCTOBER 1930 .Published By THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS 29 WEST 39th STREET, NEW YORK, N. Y. Copyright 1930