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Features

Improved Machine for the Manufacture of Spoked Wheels, Polishing Granite, and more

Cobalt--Its Properties and Uses

By Charles A. Joy

Platinized Looking-Glasses

By C. Widemann

A Plea for Our "Dumb" Slaves

The Pneumatic Tunnel Under Broadway, N. Y.

Hubbell & Capron's Improved Turbine Wheel

Universal Balance for Millstones

A Plea for the Society for the Prevention of Cruelty to Animals

What Oysters Eat

The New Explosive Dualin

The Law of "Vis Viva"

The Cultivation of Timber

Concerning Patent Office Matters

The Lightest Machine

Systematic Thinking

Mr. Rutherfurd's Star Photographs

Tyndall on Haze and Dust

Answers to Correspondents- March 5, 1870

The Zircon Light

Official List of Patents- March 5, 1870

Recent American and Foreign Patents- March 5, 1870

Applications for Extension of Patents- March 5, 1870

Departments

  • Letters

    Correspondence- March 5, 1870

  • Recommended

    New Books and Publications- March 5, 1870

  • Departments

    Business and Personal- March 5, 1870

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March 05, 1870