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Improved Steam Boiler, Locomotive Boilers

Why a Gun Becomes Hot on Firing

By Charles A. Seely

The Spectroscope and Its Revelations

By Henry Draper

Christian's Device for Oil Wells

McDonough's Caloric Engine

New Publications

Law Applicable to Reissue of Letters Patent

Special Notices

Olmsted's Patent Drill Chuck

A Four-Tool Planer

Educated Mechanics

A Just Measure

Free and Easy Legislation on Patents

Patent Claims

Issued from the U. S. Patent Office


  • Departments


  • Notes and Queries

  • New Inventions

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Self-Awareness or Illusion?

Self-Awareness or Illusion?

Solving the “Hard Problem”