 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
 |
 |
 |
 |
|
||||||||||||
 |
 |
 |
 |
 |
 |
|
|||||||||||
 |
 |
 |
|
||||||||||||||
 |
 |
 |
|
||||||||||||||
 |
 |
 |
 |
 |
|
||||||||||||
 |
|
||||||||||||||||
 |
 |
|
|||||||||||||||
 |
 |
|
|||||||||||||||
Men at Work |
||
|
The Davey Lamp, invented by Sir Humphrey Davey in 1815, was a great aid in improving saftey for miners who had previously used candles for lighting underground. The lamp used naphtha for fuel. and was 10-12 inches tall. The flame was surrounded by mesh and a glass enclosure. If the light went out it indicated a lack of oxygen caused by the presence of gas. |
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||||||||
|
|
|
|
|
|
|
|||||||||||
|
|
|
|
||||||||||||||
|
|
|
|
||||||||||||||
|
|
|
|
|
|
||||||||||||
|
|
||||||||||||||||
|
|
|
|||||||||||||||
|
|
|
|||||||||||||||
©all words and pictures on this site are copyright of Bernard Ingram and Black Cat Design
