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Direct Recording Covergence Meter


“NMC” Convergence Meter has been developed primarily as a ow cost means of continuously recording roof / floor convergence in mines, where ready access to the measurement site is possible. Direct plots of convergence versus time are obtained over a range of upto 100 mm. The Convergence Meter consists basically of a clock-work driver, a chart paper drum and a spring loaded scriber arm mounted on telescopic tubes. In use the tubes are coupled between two pins located

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