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Experiments with Galvanized Wire and Hemp Ropes - p346
doi:10.1038/scientificamerican07201850-346f
History of Propellers and Steam Navi gation - p352
doi:10.1038/scientificamerican07201850-352a
Lord Rosse's Telescope and the Binary Stars - p352
doi:10.1038/scientificamerican07201850-352b