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How to Shrink Collars on a Shaft

Mechanical Hand Rake

Tool for Drawing Broken Pump Rods

Polytechnic Association of the American Institute

The Law of Successive Species

Some Facts About Peru

The Metric System

Turning Tools

Editorial Correspondence

Professor Page the Inventor of the Ruhmkorff Coil

Guns Bursting in Action

Hardening and Tempering Steel

Adulterating Lard with Water

Beam Engines

Dispatch from Assistant Secretary Fox

The Size of Holes in Furnace Doors

A Gas Explosion

A Sensible New Year's Gift

Professor Grove on Light

Paper from Cane

Special Notice

Recent American Patent

Patent Claims

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January 28, 1865

Beyond XX and XY

Biology. Identity. Equality.