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How to Shrink Collars on a Shaft

Tool for Drawing Broken Pump Rods

Mechanical Hand Rake

Polytechnic Association of the American Institute

The Law of Successive Species

Some Facts About Peru

The Metric System

Turning Tools

Editorial Correspondence

Guns Bursting in Action

Professor Page the Inventor of the Ruhmkorff Coil

Hardening and Tempering Steel

Adulterating Lard with Water

A Sensible New Year's Gift

A Gas Explosion

The Size of Holes in Furnace Doors

Beam Engines

Dispatch from Assistant Secretary Fox

Paper from Cane

Special Notice

Professor Grove on Light

Patent Claims

Recent American Patent

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January 28, 1865

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