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Important Tests to be made of Heavy Armor Plating

A Convenient Sponge for Cleaning Slates

An Improvement in Locks and Keys

An Artificial Lake and Water Slide

A Coal Elevator for Railway Service

An Improved Slide Valve for Engines

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

A Swinging Hydraulic Capstan

New Form of Towing Steamers

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

  • To Inventors- September 13, 1890

  • Business and Personal- September 13, 1890

  • Index of Inventions- September 13, 1890

  • Recently Patented Inventions- September 13, 1890

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September 13, 1890

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