Table of contents
May 10, 1862, Volume 6 No 19 (New Series) pp289-304
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Improved Toggle-Joint Press, Steel Rifle Barrels, and more - p289
doi:10.1038/scientificamerican05101862-289
Notes on Military and Naval Affairs - pp290 - 291
doi:10.1038/scientificamerican05101862-290
Polytechnic Association of the American Institute - p292
doi:10.1038/scientificamerican05101862-292
Extension of Patents—For Whose Benefit they are Granted - p297
doi:10.1038/scientificamerican05101862-297
The Excitement in Relation to Iron-Plated Ships - p297
doi:10.1038/scientificamerican05101862-297b
Piedmont Gold Mining and Amalgamating System - p298
doi:10.1038/scientificamerican05101862-298
Recent Foreign Inventions and Discoveries - p298
doi:10.1038/scientificamerican05101862-298a
