A NEW ENGLISH OIL TESTING APPARATUS. CONSTRUCTION OF HOLLOW WALLS. Faraday's Success as a Lecturer. DOMESTIC WATER FILTERS. Improved Shovel Plow. 40I NEW APPARATUS FOB. MEASURING OIL. Manufacture of Tracing Paper With Petroleum. STEAM ENGINES AT THE AMERICAN INSTITUTE. JENNINGS' SHOVEL PLOW GUARD., scientific american, 1870-02-05
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