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