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aluminium ammonia application arranged automatic back-pressure boiler British British Electricity Authority brushes busbars cable capacity cent circuit coal coil combustion compressor condensate cooling cost Crompton Parkinson cylinder diameter diesel engine drive efficiency electrical electrode equipment factory feed fire fitted flow frequency fuel furnace gas turbine gases gear give Grid heat hour illustration increased induction motor industrial installed Institution lamp Limited liquid load London lubrication machine maintenance manufactured maximum mechanical ment metal meter method motor mounted normal obtained operation output panel pipe Plant Engineers power factor practice pressure production pump range reactance reduced regulator rotor running Ruston & Hornsby shaft shown starter stator steam steam trap steel stillages stokers suitable superheater supply surface swarf switch tank temperature thermostat tion torque tube unit utilisation valve voltage welding