hard coal

Indoors the hard-coal burner made a tropical temperature, and glowed a warm orange from its isinglass sides.

A hard-coal fire burned redly in the grate, and the dying sunset poured its last splendors through a huge square window.

Then there's the hard-coal enthusiasm that will burn steadily and faithfully by the hour.

The doctor and George Chapman sat beside the hard-coal heater, talking in low voices.