[21] The mule revolutionised cotton spinning by combining the roller drafting of Arkwright's h2o frame Together with the carriage drafting and spindle tip twisting of James Hargreaves's spinning jenny, developing a high quality yarn. Self-performing mules were being used in Bolton mills right up until the 1960s manufacturing good yarn.[21] https://website-design-bolton53085.bligblogging.com/31055983/website-design-bolton-an-overview