Grindability of Coal by the Hardgrove-Machine Method1
and gear is equal to 29.0 6 0.2 kg (64 6 0.5 lb). The machine is equipped with a counter and automatic device which can be properly adjusted for stopping the machine after 60 6 0.25 revolutions. 4.8.1 The position of the counter trip mechanism before and after the test must be used to determine the number of revolutions completed.
