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Bursting of an Army 14-inch Gun, Are Inventions Ever Willfully Suppressed and more

Capturing Frost Flowers

By S. Leonard Bastin

Sending Photographs Over a Telephone Wire

The Improved Bélin Apparatus

By Jacques Boyer

The Pier Problem at the Port of New York

How Manhattan Has Encroached on the Hudson River

Solution of the Steel Rail Problem

A Method of Producing Sound Ingots

The Submarine Sledge, Panama Pacific Exposition and more

By the Berlin Correspondent of the Scientific American

Steady Rests for Small Lathes

By Albert F. Bishop

Holding Circular Saws While Sharpening

By William Grötzinger

Why a Plane "Iron" has a "Cap"

By W. D. Graves

Some Workshop Suggestions

By B. F. Dashiell

Twelve Thousand Postage Stamps Per Minute, A Network Protector

By Thomas D. Gannaway

Simplified High-potential Apparatus, The Maxim Motorboat Silencer and more

By Our Berlin Correspondent


  • Letters

    Correspondance - December 21, 19

  • Recommended

    New Books, Etc. - December 21, 1921

  • Departments

    Inventions New and Interesting - December 21, 1912

  • Recently Patented Inventions - December 21, 1921

  • Notes and Queries - December 21, 1921

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