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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

Law Applicable to Reissue of Letters Patent

Special Notices

New Publications

Olmsted's Patent Drill Chuck

A Just Measure

A Four-Tool Planer

Educated Mechanics

Free and Easy Legislation on Patents


  • Patent Claims

  • Departments


  • Notes and Queries

  • New Inventions

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July 07, 1866

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