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Features

The Mechanical Interlocking Switch and Signal System at the Grand Central Depot, New York

European Workers

Helping the Merchant Fleet

A Combined Cotton Chopper and Cultivator

Volt and Ampere Analogies

By T.O'Conor Sloane

An Improved Musical Instrument

An Improved Hand Rake

An Improved Car Coupling- February 15, 1890

Engines of the Augusta Victoria

Photographic Notes- February 15, 1890

A New Electric Conduit for Street Cars

The Dog-Headed Opossum

An Improved Electric Signal

Some Effects of Large Currents

By Geo. M. Hopkins

Departments

  • Letters

    Correspondence- February 15, 1890

  • Recommended

    New Books and Publications- February 15, 1890

  • Departments

    Business and Personal- February 15, 1890

  • Recently Patented Inventions- February 15, 1890

  • Notes and Queries- February 15, 1890

  • Index of Inventions- February 15, 1890

  • To Inventors- February 15, 1890

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February 15, 1890