Spinning count
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Spinning count is a measure of fibre fineness and distribution developed by the English. It is defined as the number of hanks of yarn that can be spun from a pound of wool. A hank of wool is 560 yards long (560 yd/lb = 1.129 km/kg). In theory a pound of 62s wool could produce 34720 yards of yarn.
As it is now a relative simple matter to measure the average fibre diameter and distribution this system is being replaced with the specification of the average fibre diameter in micrometers and fiber distribution in standard deviations.
[edit] References
Ricketts, G. E. (1 Jun 1993). Management Guidelines for Efficient Sheep Production. DIANE Publishing, 63. ISBN 0-7881-8286-2.