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Society of Engineers
Excerpt from Society of Engineers
The severa varieties of coal may, for the most part, be ar ranged into two the one containin no bitumen, and the other distingmshe by the presence of t at substance. In the first variety, or that without bitumen, is anthracite, or glance coal, which is compact and hard, with a high lustre. Its specific gravity varies from to and it contains from 80 to 90 per cent. Of carbon, with from 4 to 7 of water. In some varieties of anthracite bitumen is present; indeed, anthracite passes gradually into the second class or bituminous coal, the rewirised varieties of which are  Caking or pitching coal, whio breaks into small pieces when heated, but on raising the heat they unite or cake into a solid mass; cherry coal, which resembles caking coal but does not soften, being very brittle; splint or hard coal of the Glasgow beds, which is harder than c erry coal; and cannel, or candle, coal, which burns readily without melting, and has been used as candles, whence its name. It is of compact and even texture, and possesses but little lustre.
The severa varieties of coal may, for the most part, be ar ranged into two the one containin no bitumen, and the other distingmshe by the presence of t at substance. In the first variety, or that without bitumen, is anthracite, or glance coal, which is compact and hard, with a high lustre. Its specific gravity varies from to and it contains from 80 to 90 per cent. Of carbon, with from 4 to 7 of water. In some varieties of anthracite bitumen is present; indeed, anthracite passes gradually into the second class or bituminous coal, the rewirised varieties of which are  Caking or pitching coal, whio breaks into small pieces when heated, but on raising the heat they unite or cake into a solid mass; cherry coal, which resembles caking coal but does not soften, being very brittle; splint or hard coal of the Glasgow beds, which is harder than c erry coal; and cannel, or candle, coal, which burns readily without melting, and has been used as candles, whence its name. It is of compact and even texture, and possesses but little lustre.
317 pages, Paperback
Published January 1, 2024
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