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Features

Roper's Patent Caloric Beam Engine

Miscellaneous Summary

Physiographic Geology

Valuable Receipts

Sherman's Portable Breastwork

How Flints Are Formed

Engines for Screw Steamers

Government Proposals for Cannon

The Science of Iron and Steel

Snow

Successful Experiments with Projectiles

Pure and Impure Water

Death of Professor Robinson

Discoveries and Inventions Abroad

Recent American Patents

Patent Claims

Issued from the United States Patent Office

Frazer's Patent Door-Fastener

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    Correspondence

  • Notes and Queries

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Why Do Facts Fail?

Why Do Facts Fail?

Deconstructing Denial