Sort of coal with a calorific value greater than 23,865 megajoule per kilogram of the ash free en wet product. Of hard coal four sorts are distinguished, namely anthracite, cokes, blast furnace coal ...

F. Isherwood, Chief Engineer, U. S. N., it appears that the Collin's steamers use anthracite on the voyage to Liverpool, and Welsh coal, also an anthracite, on the return voyage. The Welsh coal ...

The burning of anthracite coal requires appliances quite Afferent from those used for the burning of wood, or bitumin-)us coal, but the reasons for these differences, are not well un-lerstood by ...

The extraction of hard coal of all types decreased in the reporting period by 3.8% in annual terms to 111 mln metric tons. In particular, anthracite extraction volumes decreased by 3.4% to 8.5 mln ...

Bituminous coal—the primary product of mining, accounting for 80% of production—fell by 8.2%, while the most valuable ...