Browse TRAIL Inventories

The action of acid mine water on the insulation of electric conductors.A preliminary report

Preliminary investigations of storage battery locomotives :specifications laboratory tests permissible schedule

State mining laws on the use of electricity in and about coal mines

The relative safety of brass, copper, and steel gauzes in miners' flame safety-lamps

Operation and maintenance of electrical equipment approved for permissibility by the Bureau of Mines

Permissible explosives, mining equipment, and apparatus, approved prior to March 15, 1922

Permissible single-shot blasting units

Permissible junction boxes

How leakage of current from an electric shot-firing circuit causes misfires

Inspection and maintenance of mine hoisting ropes


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