A Low Water Detector - p113

doi:10.1038/scientificamerican02221862-113

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Notes on Military and Naval Affairs - pp114 - 115

doi:10.1038/scientificamerican02221862-114

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The Chemistry of Coal - p116

doi:10.1038/scientificamerican02221862-116

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Surface Condensers for Steam Engines - p116

doi:10.1038/scientificamerican02221862-116a

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The Plan of Creation - p117

doi:10.1038/scientificamerican02221862-117

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History of the Heliographic Art in Europe and America - pp119 - 120

M. A. Root

doi:10.1038/scientificamerican02221862-119

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Trittin's Coal Oil Lamp - p120

doi:10.1038/scientificamerican02221862-120

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What can be done for inventors—Advice Gratis and Advice for Pay - p121

doi:10.1038/scientificamerican02221862-121

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Strong Cannon—American Built-Up Guns - p121

doi:10.1038/scientificamerican02221862-121a

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Steam Rams - p121

doi:10.1038/scientificamerican02221862-121b

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Renewed Activity among Inventors - p121

doi:10.1038/scientificamerican02221862-121c

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The Petroleum Region—The Rock Oil Business—The Extent and Sources of Supply - p122

doi:10.1038/scientificamerican02221862-122

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The New Tariff—Development of Our Iron Interest—A Field for Inventors - p123

doi:10.1038/scientificamerican02221862-123

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Recent American Inventions - p124

doi:10.1038/scientificamerican02221862-124

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Patent Claims - pp124 - 126

doi:10.1038/scientificamerican02221862-124a

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To Our Readers - p126

doi:10.1038/scientificamerican02221862-126

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The Mortar Fleet and Mortars - p128

doi:10.1038/scientificamerican02221862-128

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