The Mechanical Interlocking Switch and Signal System at the Grand Central Depot, New York - p97

doi:10.1038/scientificamerican02151890-97

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Helping the Merchant Fleet - p98

doi:10.1038/scientificamerican02151890-98

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European Workers - pp98 - 99

doi:10.1038/scientificamerican02151890-98a

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A Combined Cotton Chopper and Cultivator - p100

doi:10.1038/scientificamerican02151890-100

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An Improved Hand Rake - p100

doi:10.1038/scientificamerican02151890-100a

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Volt and Ampere Analogies - p100

T.O'Conor Sloane, PH.D

doi:10.1038/scientificamerican02151890-100b

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An Improved Car Coupling - p100

doi:10.1038/scientificamerican02151890-100c

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An Improved Musical Instrument - p100

doi:10.1038/scientificamerican02151890-100d

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Engines of the Augusta Victoria - pp101 - 102

doi:10.1038/scientificamerican02151890-101

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Photographic Notes - p103

doi:10.1038/scientificamerican02151890-103a

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A New Electric Conduit for Street Cars - p104

doi:10.1038/scientificamerican02151890-104

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The Dog-Headed Opossum - pp105 - 106

doi:10.1038/scientificamerican02151890-105

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An Improved Electric Signal - p106

doi:10.1038/scientificamerican02151890-106

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Some Effects of Large Currents - p107

Geo. M. Hopkins

doi:10.1038/scientificamerican02151890-107

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To Inventors - p109

doi:10.1038/scientificamerican02151890-109

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