Volume 121, Issue 4
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Features
Binder Twine from the Desert
How a Use Has Been Found for an Utterly Useless Plant
The Freedom of the Skies
Some of the Problems That Will Have to be Solved as the Human Race Takes to the Air
The First Round-Trip Trans-Atlantic Airship
Further Details of the R-34 and Its Return Flight from Long Island to the British Isles
Why Hawker Failed, Getting Away from Getting Under and more
Keeping the Big Guns at the Front Effective
The Mobile Repair Shops of the U. S. Army Ordnance Department
Mechanical Equipment of the Farm
Latest Developments in Agricultural Machinery and Practical Suggestions for the Farmer