Electrical news and engineering . r of run-outs aminimum. The furnace hearth is consequently solid, withno water cooling of any kind. With the basic hearth, deadburned dolomite is used to maintain the slag line; in theacid furnace, ground ganister is used for the same conducting hearth gives a uniform bottom heating ofthe entire bath, prevents sculls, and makes speedier andmore thorough distribution of the heavier alloys, which tendto sink to the bottom of the bath. The effect of this bottomheating is considerable, and has been accurately measure!on Booth-Hall furnaces in continuou
Electrical news and engineering . r of run-outs aminimum. The furnace hearth is consequently solid, withno water cooling of any kind. With the basic hearth, deadburned dolomite is used to maintain the slag line; in theacid furnace, ground ganister is used for the same conducting hearth gives a uniform bottom heating ofthe entire bath, prevents sculls, and makes speedier andmore thorough distribution of the heavier alloys, which tendto sink to the bottom of the bath. The effect of this bottomheating is considerable, and has been accurately measure!on Booth-Hall furnaces in continuous operation. With the two-phase electric furnace a minimum of elec-trode consumption is secured, due to the fact that a mini-mum number of electrodes for a balanced polyphase loadis used. This means fewer electrodes to handle, less elec-trode breakage, and less surface burning. The loss on theauxiliary electrode is small, because it is in operation forsuch a comparatively short time. The electrode jaws are Itain electrodes Busbar. Busbar Transverse section Fig. 2.—Booth-Hall two-phase furnace. made so that the electrodes can be gripped or released byturning a handwheel oi lever al the side of the furnaolt is not therefore necessary for the meltcr to climb on topof his furnace when changing the grip on the electrode jaws are arranged in segments so as totake up and adjust themselves to the inaccuracies in thesurface of the \ roomy charging door of special constructionvided in the rear of the furnace and another door in fronlover the tap. This construction is verj similar to th«hearth and pern,: of furnaces to b side by side and a ch ng ma, hine to serve them furnace tilts ? —ward. and slagging op* ra can b< handled from either the rear or the front — so thal it en,,-. Iln h ? : and canno air getting n - of heat through the door. The door can be opened anywhere from a few inches to full open when inspectingthe bath, taking tests, or pushing scrap
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