The satisfactory execution of this important work at once placed the firm of Fairbairn and Lillie in the very front rank of engineering millwrights. Mr. Kennedy's good word was of itself a passport to fame and business, and as he was more than satisfied with the manner in which his mill machinery had been planned and executed, he sounded their praises in all quarters. Orders poured in upon them so rapidly, that they had difficulty in keeping pace with the demands of the trade. They then removed from their original shed to larger premises in Matherstreet, where they erected additional lathes and other tool-machines, and eventually a steam-engine. They afterwards added a large cellar under an adjoining factory to their premises; and from time to time provided new means of turning out work with increased efficiency and despatch. In due course of time the firm erected a factory of their own, fitted with the most improved machinery for turning out millwork; and they went on from one contract to another, until their reputation as engineers became widely celebrated. In 1826-7, they supplied the water-wheels for the extensive cotton-mills belonging to Kirkman Finlay and Company, at Catrine Bank in Ayrshire. These wheels are even at this day regarded as among the most perfect hydraulic machines in Europe. About the same time they supplied the mill gearing and water-machinery for Messrs. Escher and Company's large works at Zurich, among the largest cotton manufactories on the continent. In the mean while the industry of Manchester and the neighbourhood, through which the firm had risen and prospered, was not neglected, but had the full benefit of the various improvements which they were introducing in mill machinery. In the course of a few years an entire revolution was effected in the gearing. Ponderous masses of timber and cast-iron, with their enormous bearings and couplings, gave place to slender rods of wrought-iron and light frames or hooks by which they were suspended. In like manner, lighter yet stronger wheels and pulleys were introduced, the whole arrangements were improved, and, the workmanship being greatly more accurate, friction was avoided, while the speed was increased from about 40 to upwards of 300 revolutions a minute. The fly-wheel of the engine was also converted into a first motion by the formation of teeth on its periphery, by which a considerable saving was effected both in cost and power.