Broken tube will be placed on the cement floor or 2 cm thick iron into the sample a 2.4 kg hammer raised to a height of 600 mm, making it free-fall impact of the sample three times, each shock, 5 servings of mashed samples was mounted in the same container 
 Specimen broken in each group (five) poured into the aperture with 0.5 mm sub-sieve screening, screening to no longer leave out the pulverized coal until 
 Screen under the powder funnel into the measuring tube, gently tap to make it dense, and then gently insert the piston foot in contact with the barrel powder surface scale. Read in the measurement of cylinder port level at l metering cylinder (ie, powder actual measurement height, read to the nearest millimeter)