Another important cause of this scarcity had been the invention of the fly-shuttle, by Kay of Bury, in 1738, which by doubling the speed of the weaver's operations, had destroyed the arrangement which, up to that time, existed between the quantity of yarn spun and the weavers' demand for it. This natural balance, the fly-shuttle suddenly disturbed, and, notwithstanding the great efforts of others, it was not again adjusted until after Crompton's invention was in full operation. Such was the weavers' state of starvation for yarn, when, in 1767, Hargreaves invented the jenny, which enabled a number of threads to be spun at the same time. It was on one of these machines with eight spindles, that Samuel Crompton was in the habit of spinning the yarn which he afterwards wove into quilting, and he continued thus occupied for the five following years. During this period, being debarred from company and accustomed to solitude, he began to show a taste for music; to gratify which he was led to the first trial of his mechanical skill in making a violin, upon which he commenced learning to play. With this musical friend Crompton would beguile many a long winter night, or during the summer evenings wander contemplatively among the green lanes, or by the margin of the pleasant brook that swept round the romantic old residence of Hall-in-the-Wood. He had, however, little leisure in general to spend with his favourite instrument; the necessities of his situation compelled him to perform daily a certain amount of weaving, and he only succeeded in performing this at the expense of much time lost in mending the ever breaking ends of the yarn spun on Hargreave's machine, which was of a very soft nature, and quite unfitted for warps or for the muslins so much in demand. During this same period Arkwright had risen to eminence, by adopting and carrying into practice the ideas of Highs,[13] and one Kay a clockmaker, and had constructed his water-frame, which by means of rollers produced thread of a very superior texture and firmness. It remained, however, for Crompton to combine in his machine the improvements of Hargreaves and Arkwright, and hence was derived the name given to it of the Spinning-Mule.