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Airships in the French Army

Safeguards for the Panama Canal Locks

Bridging the Hudson River

National Academy of Sciences

Boston Meeting

By William H. Hale

Points about Needles

By H. R. Christy

The Pharmaceutical Industry of France

By Jacques Boyer

The De Pluvy Diving Dress

Some Novel Electric Labor-Saving Devices

A Pocket-Knife Artist

By Day Allen Willey

Oceanographic Museum of Monaco

Weapons Weird and Wonderful

By C. Field

The Microphotoscope--An Apparatus for Examining Minute Maps

By Alfred Gradenwitz

Birds of an Ocean Island

By B. S. Bowdish

Business and Personal Wants

The Progress of the Hollow Concrete Block Industry


  • Departments


  • Notes and Queries

  • Recently Patented Inventions

  • Index of Inventions

  • Patents

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