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adjustment air heater alinement allow amount bearing boiler efficiency boiler horsepower brass burners burning carbon cause circulation clean clearance coal condenser connected corrosion crosshead cut-off degrees F deposits diameter double reduction drum eccentric economy evaporation excess air expansion feed pump feed water fire fitted fuel oil furnace gage gases give heating surface high-pressure cylinder horsepower indicator cards installed intermediate-pressure leakage leaks loss low-pressure cylinder lower lubrication marine boilers mean effective pressure metal operation oxygen percent pipe piston rings piston rod piston valves plate poppet valves port position pounds per square proper Q.—Explain Q.—What reciprocating engine reduction gears revolutions per minute rotor safety valve Scotch boiler secured side slide valve soot speed square inch steam pressure stroke stuffing box superheater thrust tion triple-expansion engine tubes turbine blades usually vacuum vessels viscosity watertube boiler weight welding