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Features

Sewer Pipe Laid on Lake Bottom, Geology in the War, and more

Modern Suction Dredging

Pumping No Longer Restricted to Liquids

By Charles Evan Fowler

Velocity and Range of Guns

From the Black-Powder Muzzle-Loader to the Smokeless-Powder Rifle
Part 1 of 2

By J. Bernard Walker

Testing Eggs by Photography

Some of the Things Which the Eyes of the Camera Sees When it Looks Through the Hen's Creations

By Jacques Boyer

Departments

  • Letters

    Correspondence- April 20, 1918

  • Departments

    The Service of the Chemist- April 20, 1918

  • The Motor-Driven Commercial Vehicle--April 20, 1918

  • Recently Patented Inventions- April 20, 1918

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The Essential Guide to the Modern World

The Essential Guide to the Modern World