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A Suggested Cure of Gun Erosion

Agriculture the True Source of Our Wealth

Wireless Telegraphy and Telephony in the Japanese Navy

The Erection of the Quebec Bridge

An Improved Ozone Generator

By Charles H. Coar

A Home-Made Equatorial Mounting for Telescopes

By Carl L. Gruppen

Machines in the Elimination Race for the Vanderbilt Cup

Some Remarkable Results with Armor-Piercing Shells

An Improved Window Raising and Locking Device

An Improved Cutter Head

Business and Personal Wants


  • Departments

    The Heavens in October

  • Correspondence

  • Recently Patented Inventions

  • Index of Inventions

  • Patents

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