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Improvement in Power Mortising Machines, Improvement in Plow Clevis, and more

Curious Applications of Electricity

Heat and Cold

By John Tyndall

Dittenhaver's Adjustable Clothes Line Post

Turning a Movable Wheel Around a Fixed Wheel

Recent American and Foreign Patents

Editorial Correspondence

Manufacturing, Mining, and Railroad Items

Answers to Correspondents

Practical Information for Mechanics

Improvement in the Manufacture of Machinists' Tools

The New French Gas Light

Fish as Food--Its Relative Value

Patents and Claims

Issued by the United States Patent Office

Editorial Summary

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  • Business and Personal

  • Patents

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March 21, 1868

Of Shamrocks and Science

Happy St. Patrick’s Day