The Ottawa River Dam - pp255 - 256

doi:10.1038/scientificamerican04281883-255

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Does Good Work Pay? - p256

doi:10.1038/scientificamerican04281883-256

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The Great Bridge Almost Completed - p256

doi:10.1038/scientificamerican04281883-256a

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Relative Costs of Street Lighting by Electricity and Gas in New York - p256

doi:10.1038/scientificamerican04281883-256b

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Making a Drill Chuck - p256

doi:10.1038/scientificamerican04281883-256c

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Aspects of the Planets for May - p257

doi:10.1038/scientificamerican04281883-257

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An Artificial Aurora Borealis - p257

doi:10.1038/scientificamerican04281883-257a

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Seals in Long Island Sound - p257

H. C. Hovey

doi:10.1038/scientificamerican04281883-257b

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Bulkheads for Steamships - pp258 - 259

doi:10.1038/scientificamerican04281883-258

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Piefke's Filter - pp259 - 260

doi:10.1038/scientificamerican04281883-259

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The Hudson River Tunnel - pp260 - 261

doi:10.1038/scientificamerican04281883-260

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Mice-Girdled Trees - pp261 - 262

doi:10.1038/scientificamerican04281883-261

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Improvement in Tunnel and House Building - p262

doi:10.1038/scientificamerican04281883-262

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Automatic Four-Roller Mill - p262

doi:10.1038/scientificamerican04281883-262a

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Manufacture of Charcoal - p263

doi:10.1038/scientificamerican04281883-263

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Physics Without Apparatus - p263

doi:10.1038/scientificamerican04281883-263a

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Engineering Inventions - p265

doi:10.1038/scientificamerican04281883-265

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Mechanical Inventions - p265

doi:10.1038/scientificamerican04281883-265a

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Agricultural Inventions - p265

doi:10.1038/scientificamerican04281883-265b

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Miscellaneous Inventions - p265

doi:10.1038/scientificamerican04281883-265c

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Communications Received - p267

doi:10.1038/scientificamerican04281883-267

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