a wooden support made in the form of an X, and a mule is a wooden support made in the form of a Y

Machine built by Highs, Hargreaves and others which features a discontinuous process of spinning. The yarn is first stretched against the twist, and then wound onto the spindle.

A rope making machine that twists several single ply yarn or single fibers into one larger yarn.

The Jenny was the first intermittent spinning process and was developed by James Hargreaves in 1764, who called it the Spinning Jenny. A mechanism operated by hand, a single Jenny imitated the actions of about ten spinners each using an single spinning wheel. Richard Arkwright then invented the Water Frame Spinning Machine in 1769, which was followed by a development in 1779 by Samuel Crompton called the Mule, a similar machine to the Jenny but with many more spindles. See spinning and water frame.