Colt's Armory Testing Machine, Railway Power Brakes - pp175 - 176

doi:10.1038/scientificamerican03161872-175

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Interesting Lecture by Professor Tyndall—The Identity of Light and Radiant Heat - pp176 - 177

doi:10.1038/scientificamerican03161872-176

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The New York Fire Alarm Telegraph - p177

doi:10.1038/scientificamerican03161872-177

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The Yale Exploring Expedition of 1871 - p177

doi:10.1038/scientificamerican03161872-177a

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Printing the Patent Drawings - p177

doi:10.1038/scientificamerican03161872-177b

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Interior of a Greenhouse - p178

doi:10.1038/scientificamerican03161872-178

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Jones' Improved Projectile for Firearms - pp178 - 179

doi:10.1038/scientificamerican03161872-178a

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Millener's Extension Ladder - p179

doi:10.1038/scientificamerican03161872-179

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Magnesium in Marsh's Test for Arsenic - p179

John C. Draper

doi:10.1038/scientificamerican03161872-179a

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The Color of the Gulf Stream, and Its Excess of Solid Matter Accounted For - p180

William L. Walker

doi:10.1038/scientificamerican03161872-180

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The Progress of Stellar Chemistry - pp181 - 182

doi:10.1038/scientificamerican03161872-181

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Walsh's Water Wheel Governor - p182

doi:10.1038/scientificamerican03161872-182

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Chapman's Improved Saw Filing Machine - p182

doi:10.1038/scientificamerican03161872-182a

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American Art Industry - p183

doi:10.1038/scientificamerican03161872-183

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Are Experimental Tests of Turbine Wheels Trustworthy? - p183

doi:10.1038/scientificamerican03161872-183a

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Tunnelling under City Streets—The Atmospheric Railway - p183

doi:10.1038/scientificamerican03161872-183b

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A Munchausen Comet - p183

doi:10.1038/scientificamerican03161872-183c

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The Common Law of Trademarks - pp183 - 184

doi:10.1038/scientificamerican03161872-183d

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Labor and Personal Cleanliness - p184

doi:10.1038/scientificamerican03161872-184

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Measuring the Heat of Combustion - p184

doi:10.1038/scientificamerican03161872-184a

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Scientific and Practical Information - pp184 - 185

doi:10.1038/scientificamerican03161872-184b

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Answers to Correspondents - pp185 - 186

doi:10.1038/scientificamerican03161872-185b

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Recent American and Foreign Patents - pp186 - 187

doi:10.1038/scientificamerican03161872-186

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