Gas detector early detection methods relied on less precise detectors. Through the 19th and early 20th centuries, coal miners would bring canaries down to the tunnels with them as an early detection system against life-threatening gases such as carbon dioxide, carbon monoxide and methane. The canary, normally a very songful bird, would stop singing and eventually die if not removed from these gases, signaling the miners to exit the mine quickly. The first gas detector in the industrial age was the "flame safety lamp" (or Davy lamp) was invented by Sir Humphry Davy (of England) in 1815 to detect the presence of
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