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Gold in the Philippines

The Pan-American Exposition

The East River Tunnel

Liquid Air in High Explosives

Gruson Armor in the United States

Commercial Production of Liquid Air

The Plant Products of the Philippine Islands

The "Reina Mercedes"

Some Smokeless Powder Considerations

By Frederick H. M'gahie

Photography of Paintings and Drawings

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

Photography in the Colors of Nature

The Measurement of Shutter Speed

Navies of the World

The Bird Giants

By Charles Frederick Holder

To Inventors - June 3, 1899


  • Letters

    Correspondence - June 3, 1899

  • Departments

    Business and Personal - June 3, 1899

  • Recently Patented Inventions - June 3, 1899

  • Index of Inventions - June 3, 1899

  • Notes and Queries - June 3, 1899

  • Patents - June 3, 1899

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June 03, 1899