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What Becomes of Our Coal?, Honeycombs of Aluminum and more

Who Shall Work the Farms?--I

The Record of Last Year and the Prospects for 1921

Copper in Steel and the Corrosion of Cars

By A. R. Surface

Salvaging Torpedo Boats for Peaceful Uses

By William A. McGarry

From the Einstein Contest--III

An Introductory Statement of the Place Occupied by Relativity as a Phase of Human Thought

By Frank E. Law

Making Weather to Order

The Indoor Meteorology That Makes All the Difference Between Industrial Success and Failure

By Harry A. Mount

Air Plus Oil Equals More Oil

How Compressed Air Takes the Place of Natural Gas in Stimulating the Flow of Old Wells

By Robert G. Skerrett

The Papaya, or Tree Melon

By Wm. A. Murrill

The Trumpeter Swan

By T. M. Fraser


  • Departments


  • The Heavens in March, 1921

  • Inventions New and Interesting

  • Recently Patented Inventions

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