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Recently Patented Inventions
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The Mechanical Interlocking Switch and Signal System at the Grand Central Depot, New York - p97
doi:10.1038/scientificamerican02151890-97
A Combined Cotton Chopper and Cultivator - p100
doi:10.1038/scientificamerican02151890-100
Volt and Ampere Analogies - p100
T.O'Conor Sloane, PH.D
doi:10.1038/scientificamerican02151890-100b
Some Effects of Large Currents - p107
Geo. M. Hopkins
doi:10.1038/scientificamerican02151890-107