21. The Colliery Owners followed the recommendations of the inquest and issued miners with Routledge Newcastle safety lamps . 22. One of the survivors, Peter Gibbon, saw from his safety lamp that the air quality had changed. 23. The lower levels of light associated with safety lamps caused an increase in the incidence of nystagmus. 24. He also invented the first form of'Safety Lamp ', it was called the Spedding Wheel or Steel Mill. 25. Hodge had taken quite a casual attitude to it and Holmes had asked him to institute safety lamps . 26. It is replacing conventional safety lamps . 27. An explosion of firedamp, ignited by a safety lamp , in 1858 cost the lives of 25 men and boys. 28. Rather than the Davy lamp, Tyneside miners used the Geordie lamp, a similar safety lamp designed by George Stephenson. 29. In 1833 a House of Commons committee found that Stephenson had equal claim to having invented the safety lamp . 30. These structures have to be marked with red and white paint, have flight safety lamps on top, or both.
