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Improved Saw-Mill, Philosophy of Exercise, and More

Miscellaneous Summary

A Novel Mode of Telegraphing by Solar Light

The American Watch as a Time-Keeper

Horace H. Day's India-Rubber Breech-Piece

English and American Iron-Clad Ships of War

Examination of Torpedo Sent from the Navy Department

Birney's Incendiary Shell

Practice at Target Made of Hogs-Hair

A Trap to Catch a Sunbeam

American Guns

The Pitches of Screw Threads

Recent American Patents

Engines of the “Puritan” and “Dictator”

Coating Iron, White Copper, and Brass

Patent Claims

Issued from the United States Patent Office

To Our Readers

Gates's Champion Hay Elevator


  • Departments

    New Books and Publications

  • Correspondence

  • Notes and Queries

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