A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CIIEMISTRY AND MANUFACTURES. 1$ per Annum. A Chance for Inventors. THE DELAWARE SHIP CANAL AMERICAN INVENTIONS IN BAVARIA. . 4 P EDISON'S MEGAPHONE. EDISON'S MEGAPHONE., scientific american, 1878-08-24


A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CIIEMISTRY AND MANUFACTURES. 1$ per Annum. A Chance for Inventors. THE DELAWARE SHIP CANAL AMERICAN INVENTIONS IN BAVARIA. . 4 P EDISON'S MEGAPHONE. EDISON'S MEGAPHONE., scientific american, 1878-08-24


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