Hand spinning on these types of wheels, both hands are free (since the wheel is turned with a treadle, rather than by hand), so the spinner can use one hand to draft the fibres and the other to wet them. Modern powered spinning, originally done by water or steam power but now done by electricity, is vastly faster than hand-spinning. The spinning jenny, a multi-spool spinning wheel invented c. 1764 by James Hargreaves, dramatically reduced the amount of work needed to produce yarn of high consistency, with a single worker able to work eight or more spools at once. At roughly the
Spinning wheel cloth, his invention becoming known as the water frame. More modern spinning machines use a mechanical means to rotate the spindle, as well as an automatic method to draw out fibres, and devices to work many spindles together at speeds previously unattainable. Newer technologies that offer even faster yarn production include friction spinning, an open-end system, and air jets. Numerous types of spinning wheels exist, including the "great wheel" also known as "walking wheel" or "wool wheel" for rapid long draw spinning of woolen-spun yarns; the "flax wheel", which is a double-drive wheel used with a distaff for spinning linen;