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...Dewayne b sharp measurement standards copyright crc press llc a historical perspective what are of practice protocol legal metrology forensic standard reference materials conceptual basis measurements the need for types basic or fundamental derived assurance system numbers dimensions and units shape things multiplication factors those devices artifacts procedures instruments systems protocols pro cesses that used to dene realize on which all lower echelon less accurate depend may also be said store embody otherwise provide physical quantity serves as another denition is embodiment unit by its assigned value dened it can compared calibration purposes in general not independent environmental conditions true only under specied known dimension other many early were based human body length man s hand width his thumb distance between outstretched ngertips one foot certain number paces etc beginning while groups small such convenient uniform enough serve logical person impose single was ruler...