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alloys aluminium amount angle applied arc welding bearing belt bimetal boiler bolt boron British Thomson-Houston bronze capacity carbon cast cavitation centre coal coke cooling copper cost diameter drive effect efficiency electrical electrode engineering equipment factor fuel furnace gauge gear give graphite grinding gunmetal heat high speed steel increased industry installed iron Limited load machine manufacture material maximum Mechanical World melting ment metal method mill Ministry of Supply motor mould nickel normal obtained operation output paper phosphor bronze pipe plant plate possible pressure production pump ratio reduced rivets ROTATION SLIPS scrap shaft sheet shown in Fig shows slag speed spindle steam steel Stellite stress superheater supply surface temperature tensile strength tion tons tool tube tungsten unit usually valve viscosity weight welding wheel wire