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
Safety pin cover on the safety pin makes it less likely to hurt someone, a version was invented specially for use with babies' nappies, the nappy pin. This is larger and stronger than the typical safety pin. Modern nappy pins have the sliding cap to lock the pin. While the cover on the safety pin makes it less likely to hurt someone, a version was invented especially for use with babies' diapers, the diaper pin. This is larger and stronger than the typical safety pin. Modern diaper pins have either a sliding cap to lock the pin or a S shaped channel