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Scientific American, Vol. 69, No. 13 (1893) (1893)
leaf 3
ss of hardening copper, for which it was however, and necessarily end the experiment, a good awarded the John Scott medal by the city of Phila- deal of hydrogen will have passed over and been delphia, at the suggestion of the Franklin Institute, collected in the bell jar. The sequence of in 1891.… … © 1893 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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