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hard coal
hard coal
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Word History and Origins
Origin of hard coal1
First recorded in 1780–90
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Example Sentences
Many years passed, however, before hard coal came into common use.
From Project Gutenberg
Not until the beginning of this century was hard coal used for domestic purposes.
From Project Gutenberg
During the great coal strike in Pennsylvania in 1903, soft coal rates and hard coal rates were sadly disturbed.
From Project Gutenberg
Hard coal if used should be dampened before being put on the fire.
From Project Gutenberg
Hard coal of good quality has 90 per cent or more of carbon, and burns with little flame.
From Project Gutenberg
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