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Improved Camera Obscura, New Products and New Fields for Northern Labor, and More

Discoveries and Inventions Abroad

Curious Inventions of Ancient Times

Miscellaneous Summary

Valuable Receipts

The Value of Small Patents


Fisher's Patent Horse Collar

A Demand for Improvements-Bring Out Your Inventions!

Working-Beam Engines

Strike at Eminence!

The Construction of Armor Steamships

Double-Screw Steamers

Cryolite--Aluminum Minerals

Magnetic Storms

Patent Claims

Issued from the United States Patent Office

Recent American Patents


  • Departments


  • Notes and Queries

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