Figure 170.-Arched entry used only as a manway. Electric wires are not allowed. See the "Arrow" 66 or Exit" sign on the left.

Figure 171. Wooden portal, with wooden gates. Electrical wiring is crudely installed. A piece of old iron chain is hung over the danger sign. The cutout switch is not guarded and is exposed to the weather. There is no separate manway.

PIT MOUTH-Continued.

SAFE PRACTICE.

Figure 172.-Concrete portal with iron gates. Both entries are used as haulageways. There is a separate manway.

Figure 173.-Mine telephone is set in hitch in rib along main haulage road and is lighted by electricity. Miner using telephone can not be hit by passing trip. Telephone is protected if a wreck happens near it.