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Machine for Rifling Gun Barrels

Influence of Food Upon the Intellect

Miscellaneous Summary

Hard Boiling

The Great Naval Controversy

American Armor Plates

The Camphor Storm-Glass

The World's Indebtedness to Science

Special Notices

Recent Southern Intelligence

Comparison Between American and English Taxes

Patent Claims

Recent American Patent

To Our Readers

Patents Granted for Seventeen Years!


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  • New Books and Publications

  • Notes and Queries

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