The mill had 137,312 mule spindles which remained until the 1950s when they were replaced by 33,636 ring spindles, the mill being electrified at the same time.
Samuel Crompton invented the spinning mule or mule jenny in 1779, so called because it is a hybrid of Arkwright's water frame and James Hargreaves' spinning jenny in the same way that mule is the product of crossbreeding a female horse with a male donkey.
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Businessmen such as Richard Arkwright employed inventors to find solutions that would increase the amount of yarn spun, then took out the relevant patents.
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The new method was compared with the self-acting spinning mule which was developed by Richard Roberts using the more advanced engineering techniques in Manchester.