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Scientific American, Vol. 76, No. 18 (1897) (1897)
leaf 4
out 28 holes init, and the into a shallow pool, well warmed by the sun. Here diameter of each hole isabout 14 inch. In each of these pacity, and three per cent of this power was lost in heat, the minnows that soon develop are nursed until strong holes is placed a porcelain insulator having a pretty… … © 1897 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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