American Institute Fair - pp304 - 305

doi:10.1038/scientificamerican11141891-304

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A Simple Mechanical Motor - p306

doi:10.1038/scientificamerican11141891-306

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An Annunciator for Burglar Alarms, Etc. - p306

doi:10.1038/scientificamerican11141891-306a

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An Improved Stalk Cutting Machine - p306

doi:10.1038/scientificamerican11141891-306b

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An Improved Ventilator or Blower - p306

doi:10.1038/scientificamerican11141891-306c

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A Boiler Feeder, Regulator, and Alarm - p307

doi:10.1038/scientificamerican11141891-307

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An Improved Pipe Joint - p307

doi:10.1038/scientificamerican11141891-307a

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The German Army Swimming Exercises - p307

doi:10.1038/scientificamerican11141891-307b

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Bad Paving in New York - p308

doi:10.1038/scientificamerican11141891-308

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A Mousetrap - p308

doi:10.1038/scientificamerican11141891-308a

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A Simple and Convenient Music Holder - p308

doi:10.1038/scientificamerican11141891-308b

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An Improved Flat Iron and Heater - p308

doi:10.1038/scientificamerican11141891-308c

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A Proposed “Whaleback” Passenger Steamer - p309

Harold Avery

doi:10.1038/scientificamerican11141891-309

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Electrical Rock Drills - p310

doi:10.1038/scientificamerican11141891-310

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A Twin Screw Launch Run by a Compound Engine - p311

doi:10.1038/scientificamerican11141891-311

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Electric Mining Locomotives - p312

doi:10.1038/scientificamerican11141891-312

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The “Otto” Gasoline Engine - p312

doi:10.1038/scientificamerican11141891-312a

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To Inventors - p315

doi:10.1038/scientificamerican11141891-315

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