Spinning frame stolen from) another inventor called Thomas Highs. With the help of other local craftsmen the team produced the spinning frame, which produced a stronger thread than the spinning jenny produced by James Hargreaves. The frame employed the draw rollers invented by Lewis Paul to stretch, or attenuate, the yarn. The roller spinning process starts with a thick 'string' of loose fibres called a "roving", which is passed between three pairs of rollers, each pair rotating slightly faster than the previous one. In this way it is reduced in thickness and increased in length before a strengthening twist is added by
John Kay (spinning frame) horses, and perhaps was not commercially viable. But it did prove the feasibility of the new machine, known as a "spinning frame". Arkwright was thereby able to finance a more elaborate mill using water power, built in 1771 on the River Derwentat Cromford. The new machine, called a "water frame", would revolutionize the textile manufacturing industry and enrich Arkwright and his partners – but not Kay. Arkwright obtained a "Grand Patent" covering the spinning frame and other inventions in 1775. Subsequent infringements by mill-owners led him to take legal action to assert his rights. A series of trials began in