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The East River Tunnel

Liquid Air in High Explosives

The Pan-American Exposition

Gold in the Philippines

Gruson Armor in the United States

Photography of Paintings and Drawings

Commercial Production of Liquid Air

Some Smokeless Powder Considerations

By Frederick H. M'gahie

The Plant Products of the Philippine Islands

The "Reina Mercedes"

An Iceberg at St. John's, Newfoundland

Pocket Voltmeter and an Electric Soldering Iron

A Chinese Typewriter

A Feed-Water Purifier and Skimmer for Boilers

A Powerful Open Circuit Battery Cell

The Measurement of Shutter Speed

Photography in the Colors of Nature

Navies of the World

The Bird Giants

By Charles Frederick Holder

To Inventors - June 3, 1899


  • Letters

    Correspondence - June 3, 1899

  • Departments

    Index of Inventions - June 3, 1899

  • Business and Personal - June 3, 1899

  • Recently Patented Inventions - June 3, 1899

  • Notes and Queries - June 3, 1899

  • Patents - June 3, 1899

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