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Important Tests to be made of Heavy Armor Plating

An Improvement in Locks and Keys

A Convenient Sponge for Cleaning Slates

An Artificial Lake and Water Slide

An Improved Slide Valve for Engines

A Coal Elevator for Railway Service

An Improved Knife Sharpener and Polisher

The Meeting of the Great Shields of the St. Clair River Railway Tunnel

Photographic Notes- September 13, 1890

Work of Amateur Electricians

New Form of Towing Steamers

A Swinging Hydraulic Capstan

The Kola Nut

By Nicolas Pike

Killing Large Sunfish with Firearms

Engine Pounding--Ways of Stopping It

The Scientific Use of Common Things


  • Letters

    Correspondence- September 13, 1890

  • Departments

    Notes and Queries- September 13, 1890

  • Index of Inventions- September 13, 1890

  • Business and Personal- September 13, 1890

  • To Inventors- September 13, 1890

  • Recently Patented Inventions- September 13, 1890

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