Volume 121, Issue 1
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Features
Phonograph Needles of Bamboo
Some of the Manufacturing Details Involved in the Search for Softness of Tone
Some American Substitutes for Rubber
Their Value from the Viewpoint of the Investor and the General Consumer
Great Britain's Giant Bombing Plane
The Tarrant Triplane or the Story of a Bold Experiment in Airplane Construction
Great Changes in the Planet Jupiter, How the Meteorologist Aids the Aviator
Our High Prices--Have they Come to Stay?
Professor Irving Fisher's Forecast and Advice to Business Men