But Matthew Murray's most important inventions, considered in their effects on manufacturing industry, were those connected with the machinery for heckling and spinning flax, which he very greatly improved. His heckling machine obtained for him the prize of the gold medal of the Society of Arts; and this as well as his machine for wet flax-spinning by means of sponge weights proved of the greatest practical value. At the time when these inventions were made the flax trade was on the point of expiring, the spinners being unable to produce yarn to a profit; and their almost immediate effect was to reduce the cost of production, to improve immensely the quality of the manufacture, and to establish the British linen trade on a solid foundation. The production of flax-machinery became an important branch of manufacture at Leeds, large quantities being made for use at home as well as for exportation, giving employment to an increasing number of highly skilled mechanics.[4] Mr. Murray's faculty for organising work, perfected by experience, enabled him also to introduce many valuable improvements in the mechanics of manufacturing. His pre-eminent skill in mill-gearing became generally acknowledged, and the effects of his labours are felt to this day in the extensive and still thriving branches of industry which his ingenuity and ability mainly contributed to establish. All the machine tools used in his establishment were designed by himself, and he was most careful in the personal superintendence of all the details of their construction. Mr. Murray died at Leeds in 1826, in his sixty-third year. We have not yet exhausted the list of claimants to the invention of the Planing Machine, for we find still another in the person of Richard Roberts of Manchester, one of the most prolific of modern inventors. Mr. Roberts has indeed achieved so many undisputed inventions, that he can readily afford to divide the honour in this case with others. He has contrived things so various as the self-acting mule and the best electro-magnet, wet gas-meters and dry planing machines, iron billard-tables and turret-clocks, the centrifugal railway and the drill slotting-machine, an apparatus for making cigars and machinery for the propulsion and equipment of steamships; so that he may almost be regarded as the Admirable Crichton of modern mechanics.