The well-established textile processing and trading infrastructure, and the ready supply of water from the River Irwell and its tributaries, attracted entrepreneurs who built cotton mills along the banks of the river in Pendleton and Ordsall. Although Salford followed a similar pattern of industrial development to Manchester, most businesses preferred to build their premises on the Manchester side of the Irwell, and consequently Salford did not develop as a commercial centre in the same way as its neighbour. Many of these earlier mills had been based on Arkwright-type designs. These relied on strong falls of water, but Salford is on a meander of the Irwell with only a slight gradient and thus mills tended to be built upstream, at Kersal and Pendleton. However, with the introduction of the steam engine in the late 18th century, merchants began to construct mills closer to the centres of Salford and Manchester, where supplies of labour and coal were more readily available (the first steam-powered mill was built in Manchester in 1780). One of the first factories to be built was Philip's and Lee's Twist Mill in Salford, completed in 1801, the second iron-framed multi-story building to be erected in Britain. The large Salford Engine Twist Company mill was built to the west of Salford, between Chapel Street and the Irwell, and in 1806 was the first large cotton mill to use gas lighting. Many engineering companies were established in this area, including Samuel Ellis and Company at the Irwell Foundry. However, it was outnumbered by the numerous smaller factories and mills throughout the area, including Nathan Gough's steam-driven mule spinning mill, near Oldfield Road, where a serious accident occurred on 13 October 1824 (see illustration).