Colombia and the Panama Canal - p146

doi:10.1038/scientificamerican08291903-146

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A Problem for the Air-Ship Builder - p146

doi:10.1038/scientificamerican08291903-146a

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Direct Current vs. Induction Motor for Electric Traction - p146

doi:10.1038/scientificamerican08291903-146b

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The Trap-Lantern as an Insect Exterminator - p147

Harold Bolce

doi:10.1038/scientificamerican08291903-147

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Balloon Measurements of Mammoth Cave's Height - p147

Horace C. Hovey, Dr

doi:10.1038/scientificamerican08291903-147a

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Concrete House Building - pp148 - 149

doi:10.1038/scientificamerican08291903-148

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Automatic Paper-Feeders for Printing Machinery - pp149 - 150

doi:10.1038/scientificamerican08291903-149

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Development of the 90-Foot Racing Yacht - pp152 - 154

doi:10.1038/scientificamerican08291903-152

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Improved Breech Mechanism for Heavy Guns - p154

doi:10.1038/scientificamerican08291903-154

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Light Motor for a St. Louis Contest Airship - pp154 - 155

doi:10.1038/scientificamerican08291903-154a

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Machine for Grooming and Shampooing Horses - p155

doi:10.1038/scientificamerican08291903-155

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Improved Valve Mechanism - p155

doi:10.1038/scientificamerican08291903-155a

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Cable Grip or Clutch Device - p155

doi:10.1038/scientificamerican08291903-155b

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Business and Personal Wants - p156

doi:10.1038/scientificamerican08291903-156a

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