The Armour Institute, Chicago - p178

doi:10.1038/scientificamerican03251893-178

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The Bell Telephone Patents - p178

doi:10.1038/scientificamerican03251893-178a

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The World's Congress Auxiliary - p178

doi:10.1038/scientificamerican03251893-178b

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The Value of a Patent - pp178 - 179

doi:10.1038/scientificamerican03251893-178c

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The Bicycle Industry - p180

Ben Bolder

doi:10.1038/scientificamerican03251893-180

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An Improved Mine Car - p180

doi:10.1038/scientificamerican03251893-180a

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Crank Shaping Machine - pp180 - 181

doi:10.1038/scientificamerican03251893-180b

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An Improved Motor - p181

doi:10.1038/scientificamerican03251893-181

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An Improved Crude Oil Burner - p181

doi:10.1038/scientificamerican03251893-181a

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An Improved Book or Copy Holder - p181

doi:10.1038/scientificamerican03251893-181b

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A Hat Support for Miners' Lamps - p181

doi:10.1038/scientificamerican03251893-181c

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A Novel Motor - p182

doi:10.1038/scientificamerican03251893-182

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The Universal Scale - p182

doi:10.1038/scientificamerican03251893-182a

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The New Coast Defense War Ship Terror - p183

doi:10.1038/scientificamerican03251893-183

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Recreations in Photography - p184

doi:10.1038/scientificamerican03251893-184

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An Improved Traction Engine - p185

doi:10.1038/scientificamerican03251893-185

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Progress of the Cruiser Maine - p185

doi:10.1038/scientificamerican03251893-185a

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The Utilization of Old Tin Cans - p186

doi:10.1038/scientificamerican03251893-186

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To Inventors - p189

doi:10.1038/scientificamerican03251893-189

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