one cylinder as it unwound from the other._" While the foregoing series of inventions placed an almost unlimited supply of cotton yarn at the disposal of the weaver, the machinery as yet introduced was still incapable of providing yarn fit for the finest grades of cotton cloth. The "water-frame" indeed spun abundant twist for warps, but it could not furnish the finest qualities of yarn, because these were too tenuous to bear safely the pull of the rollers while they wound themselves on the bobbin. Samuel Crompton, a young weaver living near Bolton, possessed the ingenuity needful to remove this difficulty. He succeeded in combining in one machine, which from its nature is happily called the "mule," the several excellences of Hargreaves' spinning-jenny and Arkwright's water-frame. Copying after the latter, the mule has a system of rollers to reduce the roving; copying after the former it has spindles without bobbins to give the twist; and the thread is stretched and spun at the same time by the spindles after the rollers have ceased to give out the rove. "_The distinguishing feature of the mule is that the spindles, instead of being stationary, as in both the other machines, are placed on a movable carriage which is wheeled out to the distance of fifty-four or fifty-six inches from the roller beam, in order to stretch and twist the thread, and wheeled in again to wind it on the spindles. In the jenny, the clasp which held the rovings was drawn back by the hand from the spindles; in the mule, on the contrary, the spindles recede from the clasp, or from the roller-beam which acts as a clasp. The rollers of the mule draw out the roving much less than those of the water-frame, and they act like the clasp of the jenny by stopping and holding fast the rove, after a certain quantity has been given out, whilst the spindles continue to recede for a short distance farther, so that the draught of the thread is in part made by the receding of the spindles. By this arrangement, comprising the advantages both of the roller and the spindles, the thread is stretched now gently and equably, and a much finer quality of yarn can therefore be produced._"