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
SALt lamp with the natives of the Butbut tribe for days relying only on kerosene lamps and moonlight to do evening chores. SALt lamp A SALt lamp is an LED lamp powered by the galvanic reaction of an anode with saline water. It also has a USB port to charge low-power mobile devices such as cellphones, smartphones, and mp3 players. The anode must be replaced approximately every six months and the saline water daily; sea water is usable. The SALt lamp was invented and is marketed by Aisa Mijeno, a Filipino inventor and entrepreneur. She is also a faculty member of Engineering