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Submarine Mines on the High Seas

A World's Congress of Academies

The N-Rays: Are They Real or Illusory?

Charles H. Haswell's Ninety-Fifth Birthday

Belgian and American Electric Lifting Magnets

By Frank C. Perkins

Electrically-Operated Versus Steam-Driven Mine Hoists

New form of Radiation

Electrochemical Phonograph

The Japanese Naval Disasters

The Manufacture of Straw Hats

By W. Frank M'clure

The Petroleum Reservoirs of California

By H. A. Crafts

Wreck of the Russian Cruiser Bogatyr

An Arcade for New York City

The Pielock Superheater System

By Alfred Gradenwitz

Photography of Jupiter's Satellites

Rock Drill Attachment

A Novel Fly-Catcher

Patent Department

Improved Railway Chair

Compensating Device for Rope Tramways

An Improved Portable Tent

Device for Distributing Noxious Fumes

A Clothing Rack

A Tension Regulator for Overhead Cables

Business and Personal Wants


  • Departments

    The Heavens in June - June 4, 1904

  • Correspondence - June 4, 1904

  • Recently Patented Inventions - June 4, 1904

  • Notes and Queries - June 4, 1904

  • Index of Inventions - June 4, 1904

  • New Books, Etc. - June 4, 1904

  • Patents - June 4, 1904

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