... Tank - " 1. ⠀⠀ Tank - builder was standing on scaffold 6 or 7 feet from ground ; the scaffold was hanging from the top of a small tank being erected . One of the crew came from inside of the tank and dropped over the top onto the scaffold ...
Some Information on Timbering Bituminous-coal Mines
... earthing system . All the conductors of an earthing system shall have a ... earth . Provided that no conductor of an earthing system shall have a cross ... truck was usually found to be satisfactory in grounding that machine to the ...
Methods of Sampling and Analyzing Coal-mine Dusts for Incombustable Content
... voltage drop ( the voltage at the sections ranges from about 450 to 565 ) ... comparison , the storage - battery locomotives re- quire about 0.49 kilowatt ... comparison of the power demands for the two types of haulage locomotives is ...
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