31. In an era before the invention of the safety lamp , the only practical source of light was a candle. 32. Combined with new battery technologies, such as the lithium battery, it gives much better performance in safety lamp applications. 33. These required Mine Deputies to undertake statutory examinations and to carry flame safety lamps and gas detectors during inspections. 34. After the widespread introduction of the safety lamp , explosions continued because the early Davy lamps were fragile and easily damaged. 35. As a new light source, LED has many advantages for safety lamps , including longer illumination times and reduced energy requirements. 36. By 1886 a lamp with better light output than a flame safety lamp was in production by the Edison-Swan Company. 37. A safety lamp has to ensure that the triangle of fire is maintained inside the lamp, but cannot pass to the outside. 38. Elliot was keen to try new mining technologies and was an advocate of improved safety lamps , shaft detaching hooks, and coal-cutting machinery. 39. Stephenson designed a safety lamp , known as the Geordie lamp, with air fed through narrow tubes, down which a flame could not move. 40. It also led Sir Humphry Davy to devise another safety lamp , the Davy lamp, in which the flame was surrounded by iron gauze.
