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Features

Improved Turbine Wheel

Notes on Military and Naval Affairs

The Discoveries of 1861

Polytechnic Association of the American Institute

Mayberry's Cartridge

Large European Guns and Powder

Manufacture of Armor Plates--Hammered and Rolled

Philosophy of Projectiles

Photographing from Balloons in Military Reconnoissances

Testing the Strength of Electrical Currents

The British Parliament on the Fight in Hampton Roads

The Rifle

Recent American Inventions

Original Experiments with Superheated Steam

Patent Claims

Issued from the United States Patent Office

To Our Readers

Bryant's Improvement in Cranks

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Why Do Facts Fail?

Why Do Facts Fail?

Deconstructing Denial