The Pennsylvania Aerolite - p224

doi:10.1038/scientificamerican10101885-224

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Graphical Comparison of Perforation Formulæ - p224

doi:10.1038/scientificamerican10101885-224a

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Curious Features of the Electric Lighting Business - p224

doi:10.1038/scientificamerican10101885-224b

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Student Mechanics - pp224 - 225

doi:10.1038/scientificamerican10101885-224c

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A New Star within a Star Cloud - p225

Richakd A. Proctor

doi:10.1038/scientificamerican10101885-225

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An Automatic Wagon Brake - p226

doi:10.1038/scientificamerican10101885-226

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An Improved Snow Plow - p226

doi:10.1038/scientificamerican10101885-226a

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An Improved Horseshoe - p226

doi:10.1038/scientificamerican10101885-226b

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Blowing up Flood Rock, Hell Gate - pp227 - 228

doi:10.1038/scientificamerican10101885-227

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An Improved Wrench - pp228 - 229

doi:10.1038/scientificamerican10101885-228

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Improvement in Small Gas Engines - p230

doi:10.1038/scientificamerican10101885-230

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Chair Elevator for Use at Fires - p231

doi:10.1038/scientificamerican10101885-231

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The Car Coupler Trials at Buffalo, N. Y - pp232 - 233

doi:10.1038/scientificamerican10101885-232

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Engineering Inventions - p234

doi:10.1038/scientificamerican10101885-234

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Agricultural Inventions - p234

doi:10.1038/scientificamerican10101885-234a

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Miscellaneous Inventions - p234

doi:10.1038/scientificamerican10101885-234b

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Communications Received - p235

doi:10.1038/scientificamerican10101885-235

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