powered horizontal shafts on each floor by means of ropes. This was a prominent change as a rope race had to be built running the height of the mill. The engine needed more space and the engine house, boiler house and economiser were external to the main mill. Mills continued to get bigger, and were sometimes paired; two mills being driven by one engine. Another change was the trend of having carding on one floor. To achieve this, the ground floor was extended outwards behind the mill often a full mill width. In a single mill, the crosswall divided the blowing room from the rest, as it was here that there was greatest risk of fire. Mills became wider, Houldsworth Mill, Reddish (1865) was 35 m wide and accommodated 1200 spindle mules. It was of four storeys and had sixteen bays on each side of a central engine house; a double mill. The central block provided offices and warehousing. A mill had a range of ancillary buildings. Stair columns often extending above the mill and housed a water tank for the sprinkler system. The floors were higher allowing for taller windows. Accrington brick was used from 1890, decorated with yellow sandstone with moulded brick and terracotta features. Etched and stained glass was used in the offices. Mills were designed by specialist architects and architectural quality became a major consideration. The power needed and provided to drive these mills was increasing. Beam engines were installed until the 1870s when horizontal engines took over. Abbey Mill Oldham (1876) needed 700 hp, Nile Mill (1896) needed 2500 hp. By the 1890, boilers produced 160 psi, and the triple expansion horizontals became standard. Chimneys were octagonal. United States Following the American Civil War, cotton mills were built in the southern states of South Carolina, Alabama, and Mississippi. These mills grew larger as cheap labour and plentiful water power made operations profitable, which meant that the cotton could be processed into fabric where it grew, saving transportation costs. The mills were usually combination mills, (spinning and weaving) that were water powered and used a slow burn design technique. They used a belt and pulley drive system, and heavier ring frames rather than mules. At this point they only spun and wove coarse counts. The mills were mainly in open country and mill towns were formed to support them. New England mills found it increasingly difficult