Volume 72, Issue 7
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Features
A New Jet-Propelled Steam Lifeboat
Zero Weather over the United States
Cast Welding Rail Joints
Fosssl Frost Cracks
A Convenient Wrench
An Improved Corn Harvester
An Improved Brick Cutting Machine
An Improved Fender for Street Cars
The War between Japan and China
The U. S. Cyclometer
Keating Bicycle
A Novel Bicycle Frame
The Blake Transmitter
Details of Construction