Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 145,004 pages of information and 230,628 images on early companies, their products and the people who designed and built them.
A mule jenny is a hand-operated textile spinning mule.
Samuel Crompton invented the spinning mule in 1779, so called because it is a hybrid of Arkwright's water frame and James Hargreaves' spinning jenny (a mule being the product of crossbreeding a female horse with a male donkey. A female donkey is called a jenny). With the development of the self actor, the hand-operated mule was increasingly referred to as a mule-jenny.