for Coal

• A slight blow against your Davy oil lamp will extinguish it, and to light it again you will have to find a place where there is no fire damp. Take a long time looking for the place.
• Blacksmiths who make pneumatic picks should not harden them properly, so that they will quickly grow dull.
• You can easily put your pneumatic pick out of order. Pour a small amount of water through the oil lever and your pick will stop working. Coal dust and improper lubrication will also put it out of order.
• Weaken the chain that pulls the bucket conveyers carrying coal. A deep dent in the chain made with blows of a pick or shovel will cause it to part under normal strain. Once a chain breaks, normally or otherwise, take your time about reporting the damage; be slow about taking the chain up for repairs and bringing it back down after repairs.
• Derail mine cars by putting obstructions on the rails and in switch points. If possible, pick a gallery where coal cars have to pass each other, so that traffic will be snarled up.
• Send up quantities of rock and other useless material with the coal.

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