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Scientific American, Vol. 78, No. 24 (1898) (1898)
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ing in this respect from the usual vacuum con- SS of the cap forms a valve adapted to engage the valve- Too Poor to be Economical. densers. The products of condensation flow into a seat mentioned previously, so as to prevent the oil from Several leading Americans who have been seeking to reservoir,… … grow maximum crops with intelligent husbandry. many cases lagging behind. © 1898 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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