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A. E. Williams acting at distance amount of balance angle of divergence B.Sc balance required balance weight C.G. big end portion calculations centre of tread connecting-rod big end counter the effect coupled wheels coupling rod Crank boss crankarm in wheel crankpin acting crankpin and unbalanced crescent crosshead cylinder engine cylinders driving distance between centre distance G drivers see Fig driving wheels dynamic augment engine driving hammerblow increased load inside cylinder LOCOMOTIVE WHEEL BALANCING London Midland Region M.Inst.F masses per wheel mid-centre narrow gauge operate opposite wheel perfectly balanced portion with included primary railways return crank portion revolutions per second revolves rod with included secondary weights shown in Fig STEAM BOILERS steel tangent of angle trailing wheels transverse two-cylinder unbalanced crankarm W,B/F Ws W.C/F Ws Weight of connecting-rod Weight of return Weight of unbalanced WHEEL BALANCING George wheel to counter wheels and axle wheels see Fig Ws/Wp