Geordie lamp the base so that it gave more light and tried new versions on 4 and 30 November. This was presented to the Literary and Philosophical Society (Lit & Phil) of Newcastle upon Tyne on 5 December 1815. Although controversy arose between Stephenson's design and the Davy lamp (invented by Humphry Davy in the same year), Stephenson's original design worked on significantly different principles from Davy's final design. If the lamp were sealed except for a restricted air ingress (and a suitably sized chimney) then the presence of dangerous amounts of firedamp in the incoming air would (by its combustion) reduce
Davy lamp authorised person before use. Even when new and clean, illumination from the safety lamps was very poor, and the problem was not fully resolved until electric lamps became widely available in the late 19th century. A modern-day equivalent of the Davy lamp is the Protector Garforth GR6S flame safety lamp which is the approved lamp for firedamp testing in all UK coal mines. A modified version of this lamp has been used in the Olympic flame torch relays. It was used in the relays for the Sydney, Athens, Turin, Beijing, Vancouver and Singapore Youth Olympic Games. It was also used