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Why does a Crankcase Breathe?

How Alternate Pressure and Rarifaction are Produced by Apparently Balanced Piston Movements

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Scientific American Magazine Vol 120 Issue 26This article was originally published with the title “Why does a Crankcase Breathe?” in Scientific American Magazine Vol. 120 No. 26 (), p. 685
doi:10.1038/scientificamerican06281919-685