Spinning count is a measure of fiber 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 fiber diameter and distribution, spinning count is being replaced with the specification of average fiber diameter in micrometers and fiber distribution in standard deviations.
In statistics, the standard deviation (SD, also
represented by the lower case Greek letter sigma σ for
the population standard deviation or the Latin letter s
for the sample standard deviation) is a measure of the
amount of variation or dispersion of a set of values. A
low standard deviation indicates that the values tend to
be close to the mean (also called the expected value) of
the set, while a high standard deviation indicates that
the values are spread out over a wider range.
Ricketts, G. E. (1 Jun 1993).
Management Guidelines for Efficient Sheep Production. DIANE Publishing, 63. ISBN 0-7881-8286-2.
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