and both were unused by 1884. The complex was given to Sheffield Corporation in 1937, but most of it has since been demolished. Unlike most installations in Sheffield, the dam impounded the whole of the flow from the Mayfield Brook, with the result that the dam (the normal local term for the lake, rather than the structure that creates the lake) has completely silted up. Forge Dam (extant) c.1760 to c.1887 This workshop was built by Thomas Boulsover, the inventor of Sheffield Plate. It was also known as ‘Upper Forge’, ‘Whiteley Wood Forge’ and ‘Bottoms Forge and Tilt’ and was used for the manufacture of saws. Sometime before 1900 the dam became a boating pool. Thomas Boulsover first used this site for the production of writing paper, but this was unsuccessful, as the water contained ochre. By 1765, it had become a forge and rolling mill, and by 1832 was used for the production of saws, while two drop-hammers were used to beat heated metal ingots into wrought-iron. Two water wheels were supplemented by a steam engine in 1835, and the operation ceased around 1887. A showman called Herbert Maxfield used the dam as a boating pool between 1900 and 1920, and the site was bought by Sheffield Corporation in 1939. The workers’ cottages became a café. The weir is still in good condition, but the dam has suffered from silting, as its layout was similar to the Fulwood dam. Wiremill Dam (extant) c.1761 to c.1876 – Previously Whiteley Wood Rolling Mill, also known as Bowser Bottom or Thomas Boulsover's Rolling Mill. This workshop was built by Thomas Boulsover, the inventor of Sheffield Plate. It was originally part of ‘Whiteley Wood rolling mill and a saw works’. The mill produced thin steel plate suitable for sawplate and for other items fashioned from strip steel, and wire used mainly in the cutlery industry. Wiremill Dam was once the site of the largest diameter water-wheel in Sheffield. Two overshot wheels were recorded in 1829, each in diameter and wide. They rotated at 6 rpm and were fed by a head of water of about . It gained its Wire Mill name in 1855 when it was used for wire drawing. Nether Wheel 1754 to c.1891 This workshop was also known as ‘Porter Wheel’, ‘Holme Wheel’, and ‘Whiteley Wood Bottoms Wheel and Shops’. It had a 20ft fall, six working troughs, and was