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Features

Improved Salt Block, Cast-Steel Bells

Notes on Naval and Military Affairs

Appleton's Cyclopedia of Drawing

The Color Products of Coal--Mauve and Magenta

The Michigan Salt Works

The London Exhibition--Steel Manufacture

Iron-Clad Vessels Building at New York

The Way the Velocity of Cannon Balls is Measured

Extraordinary Penetration of Armor Plates

Trial of Steam Plows

Valuable Receipts

Recent American Inventions

Patent Claims

Patents for Seventeen Years

Important to Inventors

Rates of Advertising

To Our Readers

The Cheapest Mode of Introducing Inventions

Prospectus of the Scientific American

Hodgson's Chimney Fastener and Holder

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Why Do Facts Fail?

Why Do Facts Fail?

Deconstructing Denial