|
|
|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24
Miners began "rock dusting." This procedure reduced the amount of dust in the air, which
reduced the chance of an explosion. The machine here blows the dust onto the mine walls.