A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART. SCIENCE. MECHANICS CHEMISTRY AND MANUFACTURES. Vol. XLIIINo. [NEW SERIES. 1 j r$ per Annum. LEVELING ATTACHMENT FOR EARTH CARS NEW RECORDING GALVANOMETER. BY GEO. 2d. HOPKINS. RECORDING GALVANOMETER. ANDREWS' LEVELING ATTACHMENT FOR EARTH CARS., scientific american, 1880-10-30
A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART. SCIENCE. MECHANICS CHEMISTRY AND MANUFACTURES. Vol. XLIIINo. [NEW SERIES. 1 j r$ per Annum. LEVELING ATTACHMENT FOR EARTH CARS NEW RECORDING GALVANOMETER. BY GEO. 2d. HOPKINS. RECORDING GALVANOMETER. ANDREWS' LEVELING ATTACHMENT FOR EARTH CARS., scientific american, 1880-10-30
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