Super-Guns for Our Army
Ordnance Officer, Chemist and Mathematician Combined Have Doubled the Efficiency of Our Army Ordnance Since the War
Volume 137, Issue 1
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Features
Watching the Earth Turn Over
The Famous Pendulum Experiment which Makes Visible the Earth's Rotation May be Performed with Simple Apparatus
Is Mars Habitable?
Its Habitability is Made More Probable By Recent Observations Whether it is Actually Inhabited is Still Unknown
American Farmers of 4000 B.C.
A Brief Survey of the Known History of Our Southwestern Aborigines
Sunburn in the Dark
Treatment With Isolated Ultra-Violet Rays from the Sun
Primitive Irrigation Methods Still Compete With Modern Machinery
A Microbe in International Affairs
As a Detective, the Chemist Has Unearthed Processes of Vital Industrial Importance
Successful Inventors--VII
A Pioneer in the Telephone Art Gives Some Excellent Advice
When the President Broadcasts
Harding Was the First Chief Executive Heard on the Radio--Coolidge establishes a record
Small Balloons Provide New Sport
America's Longest Tunnel
Rapid Construction of the Greatest Tunnel to be Built In the New World
Stupendous Pressures
Pressures of Great Magnitude Profoundly Alter the Properties of Matter. How Extreme Pressures are Produced in the Laboratory
The Wanderings of an Oil Well
Automatic Surveying Machine Shows World's Deepest Well to be 517 Feet Out of Plumb at 6,000 Feet Depth
Our Agricultural Ellis Island
How the Department of Agriculture is Using a Famous Old Virginia Estate as a Testing Ground for Immigrant Plants
The Most Fascinating Spot on Earth
A Comet, Weighing Millions of Tons, Is to Be Sought Where It Lies Buried in Arizona
Uncle Sam, Spendthrift--XI
Failure to Develop and Deepen Our Lake and River Systems Causes an Enormous Economic Loss
From the Scrap-book of Science--Camera Shots of Scientific Events, July 1927
With the Automotive Inventors, July 1927
Inventions in the Engineering Field
In the World of Chemistry
A Department Devoted to the Advancements Made in Industrial and Experimental Chemistry
Applied Science for the Amateur, July 1927
A Department Devoted To the Presentation of Useful Ideas. Material of Value To All Will Be Found Here