Note-1 Separation may be made on the No.4 (4.75 mm),No.40 (425 mico),or No.200 (75 mico) sieve instead of the No.10 For whatever sieve used, the size shall be indicated in the report.
Note-2 Two types of dispersion devices are provided:(1) a high-speed mechanical stirrer, and (2) air dispersion. Extensive investigations indicate that air-dispersion devices produce a more positive dispersion of plastic soils below the 20 micro size and appreciably less degradation on all sizes when used with sandy soils. Because of the definite advantages favoring air dispersion,its use is recommended. The results from the two types of devices differ in magnitude, depending upon soil type, leading to marked differences in particle size distribution, especially for sizes finer than 20 micro