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The Maximum of Sun Spots

A Suggestion as to Overhead Wires

Patents to Foreigners-Government Purchase of Patents

An Improved Tool Handle

Folding Step Ladder

Improved Breast Drill

Novel Door Check

Improved Furnace Grate

New Buildings of Prominence in New York City

[See Frontispiece.]

Dr. Le Plongeon's Latest and most Important Discoveries among the Ruined Cities of Yucatan

( Continued from page 263.)

Dynamite Thrown from Cannon by Powder

The Bursting of Gun Barrels

Improved Permutation Lock

An Improved Fence Post

Miscellaneous Inventions - May 10, 1884

Agricultural Inventions - May 10, 1884

Engineering Inventions - May 10, 1884

Mechanical Inventions - May 10, 1884


  • Letters

    Correspondence - May 10, 1884

  • Departments

    Business and Personal - May 10, 1884

  • Notes and Queries - May 10, 1884

  • Index of Inventions - May 10, 1884

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