Patent Office Report for 1890 - p112

doi:10.1038/scientificamerican02211891-112

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Improvement Needed in Secondary Batteries - pp112 - 113

doi:10.1038/scientificamerican02211891-112a

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A Roller Pressure Regulator for Cane Mills - p114

doi:10.1038/scientificamerican02211891-114

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A Proposed Apparatus for a Fall of 1,000 Feet - p114

doi:10.1038/scientificamerican02211891-114a

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An Improved Gauge Cock - p115

doi:10.1038/scientificamerican02211891-115

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An Improved Bicycle Treadle - p115

doi:10.1038/scientificamerican02211891-115a

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A Velocipede Operated by Hand Levers - p115

doi:10.1038/scientificamerican02211891-115b

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The United States Life Saving Service - p117

doi:10.1038/scientificamerican02211891-117

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Triple Expansion Engines for a Tugboat - p118

doi:10.1038/scientificamerican02211891-118

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Serpollet's Steam Carriage - pp119 - 121

doi:10.1038/scientificamerican02211891-119

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Centrifugal Action of Air - p121

Geo. M. Hopkins, By

doi:10.1038/scientificamerican02211891-121

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To Inventors - p123

doi:10.1038/scientificamerican02211891-123

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Engineering and Mechanics - p124

doi:10.1038/scientificamerican02211891-124

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Experimental Science - p126

Geo. M. Hopkins, By

doi:10.1038/scientificamerican02211891-126

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The Scientific American - p126

doi:10.1038/scientificamerican02211891-126b

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