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Dredges of Other Days, A Simple Matter of Duty and more

By Rudolph L. Zimpei

On River and Canal

What the Government Is Doing to Bring These Waterways to the Level of Use Maintained by the Lakes

By Robert G. Skerrett

The Romance of Invention--VIII

The One-Man Machine Gun and Its Inventor

By C. H. Claudy

The Exploring Rocket

The Missile That Could Be Shot to the Moon, and Its True Purpose

Airplanes That Are Different

How the European Constructors Are Striking Out Along New Lines

From Coal Barge to Bunker

A Digging and Elevating Outfit of Interesting Design and Great Adaptability

By J. F. Springer

Eliminating the Lost Call

How a Simple Telephonic Novelty Cuts Out a Vast Amount of Lost Motion in Office and Factory

By Robert G. Skerrett

Putting Flax on a Modern Basis

How an Industry That Has Always Been Conducted by Hand is Feeling the Touch of the Mechanical Engineer

The Double Fovea in Birds of Prey, Restoring Stained Glass Windows


  • Departments

    Correspondence - February 14, 1920

  • Inventions New and Interesting - February 14, 1920

  • Recently Patented Inventions - February 14, 1920

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