Although exceedingly simple, the invention, when combined with other improvements, was of great importance, as it enabled the weaver to work more quickly, with a less expenditure of effort, and weave a width of cloth which had required two weavers before. For some reason, the invention does not appear to have been used much in the cotton industry for about thirty years after its appearance, although it was used in the Yorkshire woollen industry, regardless of the claims of the inventor.[237] Besides his invention of the “flying shuttle,” Kay effected a considerable improvement in the reeds for looms, and in 1745 took out a patent for a power-loom, and also applied his ingenuity to carding and spinning, but in these latter efforts he apparently attained little success.[238] In 1760 his son Robert effected another improvement in the loom by his invention of the “drop-box,” which enabled the weaver “to use any one of three shuttles, each containing a different coloured weft, without the trouble of taking them from and replacing them in the lathe.”[239] In 1764 the elder Kay made an appeal to the Society of Arts for recognition of his work, and claimed to have many more inventions that he had not put forward, owing, as he said, to the treatment he had received from those engaged in the cotton and woollen industries, and from Parliament. The story of his difficulties, of his emigration to France, and of his death there, is so well known as not to require repetition.[240] [Footnote 237: Guest, _ibid._, p. 9. Espinasse, _ibid._, p. 313.] [Footnote 238: Espinasse, _ibid._, pp. 310-318.] [Footnote 239: Guest, _ibid._, p. 9.] [Footnote 240: Espinasse, _ibid._] The inventions of the flying shuttle and the drop-box, with the introduction of Dutch looms, were the most important developments in weaving in the first part of the eighteenth century. But there was another development which should be noticed, referred to by Ogden, which, he states, gave rise to a new and important branch of trade in the Manchester district. Owing to the greater variety of patterns attempted in figured goods, a more complicated loom became necessary, as well as the employment of a boy to manipulate the treadles for the raising and lowering of the warps which was required in the weaving of such goods. The goods produced were consequently known by the name of “draw-boys.” But the complicated loom was also more expensive, and it is significant that, at this time, weavers were having “looms mounted for them at great expense which the employers advanced.”[241] [Footnote 241: Ogden, _ibid._, pp. 76-77. This loom was the predecessor of the Jacquard loom. Chapman, _ibid._, pp. 22-23.]