The Coulter Counter, an electronic particle-sizing instrument, can appraise the average fineness and fineness distribution in wool tops with precision equivalent to that of the standard microscopic method. A time saving of 1/2 to 3/4 is realized over the microscopic method, with avoidance of subjective errors inherent in the latter. Oper ating conditions are described, along with methods of sampling, preparing a nonswelling but conductive solvent system, calibrating and checking the instrument, and minimizing error. Examples of results are presented with comparative microscopic data.
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References
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American Society for Testing Materials. " ASTM Standards on Textile Materials, Committee D-13." Philadelphia, Pa., 1959, p. 232.
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Von Bergen, W., Materials Research and Standards1, 175 (1961).
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Berg, R.H., "Symposium on Particle Size Measurement." ASTM, Special Technical Publication No. 234, 245 (1958).
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"Theory of the Coulter Counter," Coulter Electronics . 5227 North Kenmore Avenue, Chicago 40, Illinois.
