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...Portable skid resistance tester also known as the british pendulum was originally designed in s by percy sigler to measure slip of floors government buildings during late instrument adopted and redesigned then road research laboratory rrl now transport trl although basically unchanged w f stanley part munro group today london has continually refined improved original design since production began still used study problems maintenance public highways is utilised test frictional new roads markings iron works health safety executive hse identified that excess slipping accidents uk occur on wet most usually relatively smooth regularly pedestrian walkways flooring within offices shopping malls factories airports sports surfaces both at stage investigation based izod principle operation a mass rotates about vertical spindle head fitted with rubber slider which specific hardness resilience when released from horizontal position strikes sample surface constant velocity distance travelled after...