The Roberts Engine - pp242 - 243

doi:10.1038/scientificamerican06011878-342a

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An Electrical Gyroscope - p335

Geo. M. Hopkins

doi:10.1038/scientificamerican06011878-335

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Do Inventions Injure the Laborer? - p336

doi:10.1038/scientificamerican06011878-336

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Professor Joseph Henry - pp336 - 337

doi:10.1038/scientificamerican06011878-336a

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Meddlers in Arts in which they are not Skilled - p337

doi:10.1038/scientificamerican06011878-337

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Clearance and Compression - p337

doi:10.1038/scientificamerican06011878-337a

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Astronomical Notes - p338

Berlin H. Wright

doi:10.1038/scientificamerican06011878-338

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Russian Torpedo Boats - p338

doi:10.1038/scientificamerican06011878-338a

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The Empire Dustless Ash Sifter - pp338 - 339

doi:10.1038/scientificamerican06011878-338b

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Andrews' Draught Apparatus for Stoves - p339

doi:10.1038/scientificamerican06011878-339

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Improved Mosquito Net Frame - p339

doi:10.1038/scientificamerican06011878-339a

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Communications - p340

doi:10.1038/scientificamerican06011878-340

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Notes on the Telephone - p341

L. L. Duerden

doi:10.1038/scientificamerican06011878-341

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Improved Vertical and Horizontal Vise - p342

doi:10.1038/scientificamerican06011878-342

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New Collapsing Boat - p343

doi:10.1038/scientificamerican06011878-343

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The Ant Bear - p343

doi:10.1038/scientificamerican06011878-343a

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Cigarette Making by Machinery - p344

doi:10.1038/scientificamerican06011878-344

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Recent Eruption of Mount Hecla - p345

doi:10.1038/scientificamerican06011878-345

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American Steam Fire Engines - p345

doi:10.1038/scientificamerican06011878-345a

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Some Recent Facts About Common Poisons - p346

doi:10.1038/scientificamerican06011878-346

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Perpetual Motion - pp346 - 347

doi:10.1038/scientificamerican06011878-346a

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Observations on the Transit of Mercury of May 6, 1878 - p347

J. Walter Wood and Alfred M. Mayer

doi:10.1038/scientificamerican06011878-347

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Communication Received - p348

doi:10.1038/scientificamerican06011878-348b

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