Safety lamp could create a sufficient updraft that firedamp would not penetrate down the chimney. Further observations of the speed of flame fronts in fissures and passageways led him to design a lamp with fine tubes admitting the air. Sir Humphry Davy was asked to consider the problems of a safety lamp following the Felling explosion. Previous experimenters had used coal gas (chiefly carbon monoxide) incorrectly, believing it to be the same as firedamp. Davy however performed his experiments with samples of firedamp collected from pits. As an experimental chemist, he was familiar with flames not passing through gauze; his experiments enabled
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