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Scientific American, Vol. 35, No. 2 (1876) (1876)
leaf 4
als are of two kinds, those which rock the support and so toll the bell or blow the whistle, the average level, indicated by the dotted line in our engraving. are seen and those which are heard. To the first class be- latter by air forced out by the moving water inside. These Ocean waves ata… … COURTENAY’S AUTOMATIC © 1876 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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