A passage connecting other passages.
The metal frame erected over a shaft, which bears the
hoisting wheels from which the cages are suspended.
Coals containing over 32 percent volatile matter.
"A" Bituminous Coal
A non-binding bituminous coal with less than 69% fixed
carbon, more than 31% volatile matter and 14,000 or more
"B" Bituminous Coal
A non-binding bituminous coal having between 13,000 and
"C" Bituminous Coal
A binding or non-weathering coal having between 11,000
and 13,000 B.T.U.
An engine with a winding drum and rope which hauls or
hoists a trip or cage.
A large class of organic compounds containing only carbon
and hydrogen, and occurring in coal, petroleum and natural