Society of Glass Technology · [Sheffield] · leaf 573
entering the ducts,preferably from above, arearranged in groups of two orFig. 115. three for polyphase currents, or are alternately of opposite polari-ties when single-phase or direct current is used. Supply trans-formers may be arranged for alternative series or parallel con-nection, for use at… … 258. Gaseous-fuel Furnaces. H. N. Davis and W. R. Twigg(Brit. Pat. No. 122673, December 28th, 1917, No. 19189).— Furn aces speciallyadapted to be fired bycoal gas as supplied bygas companies are pro-vided with reversibleregenerators formedentirely within the fur-nace structure, to whichair is…
Glass
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