A 21½-Knot Battleship - p278

doi:10.1038/scientificamerican10201906-278

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Completion of the Pennsylvania Double Tunnels - p278

doi:10.1038/scientificamerican10201906-278a

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Panama Canal to be Built by Contract - p278

doi:10.1038/scientificamerican10201906-278b

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The Status of the Liquid Barretter - pp278 - 279

doi:10.1038/scientificamerican10201906-278c

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Something about Cereal Breakfast Foods - p279

doi:10.1038/scientificamerican10201906-279

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The Need and the Testing of Pure Drugs - pp280 - 281

Hugo Erichsen

doi:10.1038/scientificamerican10201906-280

PDF (539 KB)

A Retrospect of the Vanderbilt Cup Race - pp281 - 282

doi:10.1038/scientificamerican10201906-281

PDF (420 KB)

The Canadian Pacific Railway Company's Irrigation Project - pp284 - 285

Kittredge Wheeler

doi:10.1038/scientificamerican10201906-284

PDF (471 KB)

An Electric Powderless, Smokeless, Flashless, and Soundless Gun - p286

Obed C. Billman

doi:10.1038/scientificamerican10201906-286

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Photographing a Devil Fish—The Chameleon of the Sea - pp286 - 288

Charles Frederick Holder

doi:10.1038/scientificamerican10201906-286a

PDF (634 KB)

Apparatus for Mixing Different Grades of Rice - p288

doi:10.1038/scientificamerican10201906-288

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A New Method of Propelling a Ship - p288

doi:10.1038/scientificamerican10201906-288a

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Means for Facilitating the Cleansing of Street Catch Basins - p288

doi:10.1038/scientificamerican10201906-288b

PDF (198 KB)

Sound Deflector for Pianos - p288

doi:10.1038/scientificamerican10201906-288c

PDF (198 KB)

Business and Personal Wants - p290

doi:10.1038/scientificamerican10201906-290

PDF (270 KB)