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Scientific American, Vol. 52, No. 16 (1885) (1885)
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r—the air compressor—and the rock drills which degrees less than the theoretical temperature due to utilize that power. These being the two most promi- and when greater éapacity is needed, to add the other pressure, had no heat been absorbed; while with” nent features in the plant when fitted for… … © 1885 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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