Electrolysis, Cambridge Water Works, 6-inch pipe from Boylston Street near Eliot Street, showing electrolytic pittings after storing 13 months in Water Works shop (compare with No. 5809), Cambridge, Mass., Jan. 10, 1906

Electrolysis, Cambridge Water Works, 6-inch pipe from Boylston Street near Eliot Street, showing electrolytic pittings after storing 13 months in Water Works shop (compare with No. 5809), Cambridge, Mass., Jan. 10, 1906

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