History of chemistry iodine first, but both scientists acknowledged Courtois as the first to isolate the element. In 1815, Humphry Davy invented the Davy lamp, which allowed miners within coal mines to work safely in the presence of flammable gases. There had been many mining explosions caused by firedamp or methane often ignited by open flames of the lamps then used by miners. Davy conceived of using an iron gauze to enclose a lamp's flame, and so prevent the methane burning inside the lamp from passing out to the general atmosphere. Although the idea of the safety lamp had already been demonstrated by
History of South Shields in Victorian times, drawing immigrants from far and wide. In South Shields the population soared from approximately 12,000 in 1801 to 75,000 by the late 1860s. Collieries in South Shields included: Coal mining was very hazardous. Shafts could collapse at any time and before the safety lamp was invented in 1815 naked flames carried by miners to light their way could ignite gas underground causing explosions and many deaths. Some mines even had shafts that stretched several miles out under the sea. Overcrowding in the town made sanitation a problem, partly solved by Cleadon Water Pumping Station (a large tower