Pneumatic Tubes for Mail Service - p384

doi:10.1038/scientificamerican12171892-384

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The Meteors of November, 1892 - p384

Daniel Kirkwood

doi:10.1038/scientificamerican12171892-384a

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Dr. Ernst Werner Siemens - pp384 - 385

doi:10.1038/scientificamerican12171892-384b

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An Improved Exhaust Nozzle - p386

doi:10.1038/scientificamerican12171892-386

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The Henrion Dynamo - p386

doi:10.1038/scientificamerican12171892-386a

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An Improved Breast Collar - p386

doi:10.1038/scientificamerican12171892-386b

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The Hygienic Treadmill - p387

doi:10.1038/scientificamerican12171892-387

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Rod and Ring Experiment - p387

Geo. M. Hopkins

doi:10.1038/scientificamerican12171892-387a

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Some of the “Cholera Streets” in Hamburg - pp387 - 388

Annesley Kenealy

doi:10.1038/scientificamerican12171892-387b

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Improved Recording Pressure Gauge - pp388 - 389

doi:10.1038/scientificamerican12171892-388

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Metropolitan Sewerage System Surrounding Boston - pp390 - 391

B. G Underwood

doi:10.1038/scientificamerican12171892-390

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To Inventors - p393

doi:10.1038/scientificamerican12171892-393c

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