OCR Text |
Show r Combating Coal Dust Blasts I pfl v,)rV , s H fT .? . ' , , 3 , -f t - f -Jf; if: , 7- "?tv - r' - ! ttl Ooaraust explosions, like the one seen in the above oioture have taken the lives of thousands of miners. But now the Federal Bureau of Mines believes it has found a way to combat them with this "dust cannon " shown below A charge of black powder is fired which sends the dust tf there ts any, spraying in all directions. That is warning to miners' 88(6 distance p""is were taken at a bureau of mines tesO |