Electricity in Coal Mines
THE use of electricity in coal mines dates almost from the time when it was realized chat it could be used to produce mechanical power. The first motor put in service underground was installed to drive a small pump nearly 40 years ago, and since then the use of electricity in mines has reached an extent undreamed of at chat time. We now find its universal adoption in all the mining countries of the world.
Cables, circuit breaker, explosion-proof, inflammable material, transformers, Electricity, Mine, Mines, Motors, Oil, Oils, Pressure, Underground