Electrolysis, Boston Water Works, Boston-Lowery hydrant pot, from end of 6-inch main River Street, showing electrolytic pittings, Dorchester, Mass., Oct. 29, 1904

Electrolysis, Boston Water Works, Boston-Lowery hydrant pot, from end of 6-inch main River Street, showing electrolytic pittings, Dorchester, Mass., Oct. 29, 1904

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