Improved Magneto-Electric Battery - pp353 - 354

doi:10.1038/scientificamerican12071861-353

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Notes on Military and Naval Affairs - pp354 - 355

doi:10.1038/scientificamerican12071861-354

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The Geological History of North America - p356

Stevens

doi:10.1038/scientificamerican12071861-356

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Magnetic Electricity - p356

doi:10.1038/scientificamerican12071861-356a

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Chemistry of Iron - p357

doi:10.1038/scientificamerican12071861-357

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Hardening and Tempering Tools and Metals - p357

doi:10.1038/scientificamerican12071861-357a

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Testing Boiler Water Gages - p357

doi:10.1038/scientificamerican12071861-357b

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Embossing Designs on Metals - p357

doi:10.1038/scientificamerican12071861-357c

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Manufacture of Steel - pp359 - 360

doi:10.1038/scientificamerican12071861-359

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Fifteen Thousand Patents Secured Through our Agency - p361

doi:10.1038/scientificamerican12071861-361

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Influence of Inventors Upon their Age - p361

doi:10.1038/scientificamerican12071861-361a

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England and the United States - p361

doi:10.1038/scientificamerican12071861-361b

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Interesting Facts about Electroplating - pp361 - 362

doi:10.1038/scientificamerican12071861-361c

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Melodeons—Harmoniums - p362

doi:10.1038/scientificamerican12071861-362

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The Coast Survey and the Government - p362

doi:10.1038/scientificamerican12071861-362a

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Information Useful to Patentees - p363

doi:10.1038/scientificamerican12071861-363

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Recent American Inventions - p363

doi:10.1038/scientificamerican12071861-363a

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To Our Editorial Brethren - pp363 - 364

doi:10.1038/scientificamerican12071861-363b

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Patent Claims - pp364 - 366

doi:10.1038/scientificamerican12071861-364

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