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actual allowed hours amount analysis applied assembly assess average Bakelite base rate bench bonus earnings cause chutes connexion conveyor cost cycle Decimal dial records easy elements elimination ensure example fact factor film fixture follows gauge given graph hand handle important incentive scheme increase Industrial Psychology industry inspec inspector involved knurled labour large number lay-out lighting machine loading measurement methods minute motion economy motion study mould necessary normal number of operators obviously operator's organization output percentage perform personnel pieces per hour PITMAN PRESS practice premium bonus production rating efficiency reason recording reduced result saving screws seconds seen selection Self-tapping setter shown skill slide slide rule solder speed and effort Stop Watch study department study observer study sheet supervision swarf taken target tion tip tool tool training department trucking wages department waste week worker