The Otto Gas Engines at the Columbian Exposition - pp305 - 306

doi:10.1038/scientificamerican11111893-305

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Amateur Naval Operations - pp306 - 307

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Notes from the Worlds Columbian Exposition Chicago 1893 - p307

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The “Paragon” Speed Indicator - p308

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Boring Machine for Corliss Engine Cylinders - pp308 - 309

doi:10.1038/scientificamerican11111893-308a

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An Improved Electric Motor Truck - p309

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A Heater and Condenser - p309

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Mechanical Arithmetic - pp309 - 310

Dorr E. Felt

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Optical Goods at the Exposition - p310

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Russian Exhibits - pp311 - 312

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Improved Construction of Floors, Ceilings, Arches, Etc - p312

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Western Electric Company's Luminous Sign - pp312 - 313

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The World's Columbian Exposition—The Court of Honor - p313

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American Historical Exposition in Madrid - p315

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A Geometrical Educational Appliance - p315

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To Inventors - p317

doi:10.1038/scientificamerican11111893-317b

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