Table of contents
May 24, 1862, Volume 6 No 21 (New Series) pp321-336
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Improved Screw and Tapping Machines - pp321 - 322
doi:10.1038/scientificamerican05241862-321
Notes on Military and Naval Affairs - pp322 - 323
doi:10.1038/scientificamerican05241862-322
Polytechnic Association of the American Institute - p324
doi:10.1038/scientificamerican05241862-324
Extension of Patents—For Whose Benefit they are Granted - p329
doi:10.1038/scientificamerican05241862-329
Convention of Sorghum Sugar Manufacturers - p329
doi:10.1038/scientificamerican05241862-329b
Reports of Our Military Commission to Europe - pp329 - 330
doi:10.1038/scientificamerican05241862-329c
Recent Foreign Inventions and Discoveries - p331
doi:10.1038/scientificamerican05241862-331
