Hague, Charles Arthur · New York : McGraw Publishing Company · leaf 127
red thefield of vertical machinery. Within 10 years of its first appear-ance, say by 1873, it had been reduced practically to a repeatedand standard type; and as a compound condensing, duplex,and so-called low duty engine, had been installed by 1880hi about 90 pumping stations, with an aggregate… … WORTHINGTON DUPLEX PUMPING ENGINE 107 with their center lines parallel with each other; each engineworking the main steam valve of the other; these main valvesbeing of the plain slide variety and generally fitted with meansfor balancing the steam pressure; but when cut-off valvesare used, each…
Pumping machinery
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