Denton, Greater Manchester and then abandoned. After hatting, the most important industry in Denton was the manufacture of lead-acid batteries by Oldham Batteries (Oldham & Son Ltd). In 1865, Joseph Oldham established a millwright general engineering shop and by 1887 this company was manufacturing machinery for the hat-making industry. Another important industry in the area was coal mining and shortly after 1887 the company began making machinery and equipment for this industry, which included miners' portable lamps. Up to this time, miners had always used the safety lamp devised in 1815 by Sir Humphry Davy (1778–1829) but this new battery-powered Davy lamp eventually
The Racecourse Colliery lamp' mines, i.e. the miners would have to make do with tallow candles set in a lump of clay. Mines were run on a day-to-day basis by the butty, this position can be compared to the modern-day contactor who would agree to sell coal to the mine owner at a fixed price. The butty would also hire and fire the men as required and at a pit like this, between six and 30 men could be employed. Every morning before the start of the shift the butty would go down with his safety lamp and check the workings for gases