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More Experiments with Iron Targets--Whitworth and Armstrong Guns

The Improved Polar Refrigerator

Trial Trip of the Morning Star

Taxidermy--Preserving the Skins of Quadrupeds, Fish and Insects

Hints for Housekeepers

Valuable Receipts

Defective Wrought-Iron

The Proposition to Introduce a State Patent System

The Proposed Canal Enlargements

Our National Defenses

Important Patent Trial--Cotton-Cleaning Machines

The Iron-Clad Steam-Battery Roanoke

The Attack on Charleston

Practical Hints to the Machinist

Cincinnati Water Works--The Engineers Report

Preserving Botanical Specimens

Patent Claims

Issued from the United States Patent Office

Recent American Patents


  • Correspondence

  • Notes and Queries

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April 25, 1863

Confronting Common Wisdom