Volume 125, Issue 18
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Features
Prehistoric Sculpture
An Account of the Discovery of Two Bisons Sculptured in Clay by the Cro-Magnons of 25,000 Years Ago
The Role of Research
Creating New Things and Revising Old Things for the Industrial World
America's First Model Airway
Britain's New Battle Cruisers
Railways of the World
Comparison of the Mileage, Equipment, Working Force and Total Investment of the Eight Leading Railroad Systems
Science in Safe-Breaking
How Modern Technology Works For and Against the Yeggman
The 4000-Pound Demolition Bomb
A Means for Detonating 2000 Pounds of T.N.T. on a Selected Target
Leading Armies of the World
Comparison of the Active Armies, Trained Reserves, Available Manpower and Field Artillery of the Five Leading Powers
High-Speed Fighting Ships
The New Army Sixteen-Inch Gun
Exhibition Firing of the Most Powerful Coast Defense Gun in Existence
Seats for 125,000
Oakland's Giant Stadium, Cut Out of the Center of a Mountain
Stainless Iron--A New and Striking Product
Our Point of View, December 1921
Abraham Lincoln and the Repeating Rifle
How an Inventor's Struggle for Recognition Was Assisted by the Action of the President
News and Music from the Air
What the Radio Telephone Means to the Farmer and Business Man at Home and at Work
The Mechanics of Ordnance Figures
Our Reforestation Activities
Some Facts and Figures About Tree Planting on a Gigantic, Yet Still Insufficient, Scale
Phosphorus, the Backbone of Life
America's Great Deposits of This Chemical for Fertilizers and Through Them for Food
Why Weary Metal Fails under Light Loads
The Causes of Steel Fatigue, and the Ticklish Problem of Testing Against It
The Revival of the Monoplane
Reasons Why This Type, Once Replaced by the Biplane, Has Again Become the Favorite
Difference Between Molds and Wood Destroyers
The Mechanism of the Pipe Organ
What Happens When the Player Passes His Fingers Over the Keys
The Oil and Albumen Content of Seeds
A Study of the Conditions Under Which the Seeds of Oil-Bearing and Textile-Producing Plants Give Their Highest Yields
Restoring Sight to Blind Animals
Engineering in Truck Tire Building
Designs Which Decrease Wear, Prevent Slipping and Increase the Economy of Truck Operation
The Banana and Its Uses
Getting Acquainted with This Tropical Fruit of Which There are Over Seventy Varieties
Recent Studies of the Venomous Snakes
New Light on Their Behavior in Attack and Defense, and on the Chemistry of Their Venom
Crossing San Francisco Bay by Bridge, Fill and Tunnel
Engineers Propose a Six-Mile Vehicular and Railroad Structure Joining San Francisco and Oakland, California
Fire Tests of Building Columns, Freak Boiler Explosion with a Man Inside
How Marine Worms Catch Their Prey
A Study of These Interesting Forms of Sea Life, Which Abound in Great Numbers and Wide Variety
A Map's Other Name is Ananias
The Various Projections Used in Representing the Earth's Surface, and What They Do to the Facts
Rock Crystal Balls, Acetylene as Auto Motor Fuel
Curator of Mineralogy, American Museum of Natural History
A Wilderness Industry
How Gold Is Extracted Out of Ores on a Huge Scale in Order to Make It a Profitable Business
Keeping Growing Potatoes Cool
The Story of Sugar
Where the World's Supply Comes From, and How It Is Converted from the Raw Material
The Self-Supporting College
Moss Scrubber for Irrigation Projects, How More Light Speeds up Vision, and more
A Climax in Concrete Construction
Erecting An Eighteen Story Reinforced Concrete Building at a Lower Cost Than a Structural Steel Type