Volume 127, Issue 4
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Features
Where Necessity Was the Mother of Invention
Safes and Safe-Breakers--I
The Story of the Everlasting Struggle Between the Safe Builder and the Bank Robber
The Spirit-Photograph Fraud
The Evidence of Trickery, and a Demonstration of the Tricks Employed
Building a Bridge Within a Bridge
A Plan for Strengthening the Brooklyn Bridge and Enlarging Its Carrying Capacity
Colloidal Metals That Cure Human Ills, Ammonia Table
Railroad Electrification in Chile
An Extensive Undertaking to Insure the National Prosperity of Our South American Neighbor
Our Point of View, October 1922
The Truth About the Brooklyn Bridge
Hypnosis and Surgery
Bell and His Telephone
Some of the Little Known Facts About the Great Inventor and His Work
Taking the Roughness Out of Our Roads
The "Lusitania" and the Submarine Salvor
Some of the Schemes Proposed for Dealing with the War's Most Famous Wreck
New Orleans' Big Port Improvement
Preparing for the Future World Trade of the Southern Metropolis
The Parsons Steam Turbine
Story of the Early Struggles and Final Triumph of a Great Invention
Iron and Steel in Brazil
What Is Cold Light?
New Tasks for the Weatherman
A Candidate for the British-American Cup Contest
The Electro-Magnet at the Throttle
Details of Still Another Type of Automatic Train Control Now Being Developed
The Automatic Collision-Dodger, A Successful Marl Pump and more
Our Strenuous Geological Survey--III
How Geologists and Water Engineers Keep Track of Our Natural Resources
Sewer Pipe Investigation
The Golden Age of Peru
Speculations as to Its Magnitude, and Relics from It Recently Added to Our Museums
Cannon-Ball Tests of Concrete, The Age of Insects and more
The Thunderbolts of Peace
Modern Industrial Explosives -- Their Manufacture and Use
Chemistry and Preventive Dentistry
Colloids and Your Health
Harvesting Sugar Cane by Machine, Making the Use of Gas in the Home, Safe
The Twenty-Hour Week
Why It Is Not Possible for the Coal Miner to Work Steadily, and What This Means to the Industry
The Green Japanese Beetle
New Jersey's Efforts to Subdue a New and Dangerous Pest
Speeding Up the Auto-Tag Industry, Symbiosis in the Forest and more
The Microscopy of Foods
A Study of Starch, the World's Premier Alimental Substance
Production of Rust by Carbonic Acid
The Ultraviolet in Sunlight
Industrial Uses and Limitations of this Portion of the Solar Radiation