Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 759
The Fuel used for heating the retorts may be either coal or coke, according to the relative value ofeach in the district. If coal is used, a well-regulated bench will require about 18 to 20 per cent, of thecoal distilled ; that is to say, to heat the retorts for the production of 12,000 cubic feet…
Mechanical engineering
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