Volume 128, Issue 4
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Features
Big and Fast Liners of the Future
Atoms: Their Size and Number
A New Version of the Revolving Stage Idea
Sand-Blasting the Clouds for Man-Made Weather
Bombs and Bomb Plots
Something of the History and Construction of the Terrorist's Favorite Weapon
Pompeii Uncovered
Restoring the Ancient Italian City to Its Normal Form by Careful Excavation and Extensive Reconstruction
Tiny Air Bubbles and Giant Dams
How Air Jets Protect a Great Dam Against the Destructive Fields of Ice
Curious Concrete Bridge Tests, A Rush Job in Dam Construction
Current Psychic Investigation in Europe
Statements from Well-Known Psychic Workers, Baron von Schrenck Notzing and Mme. Bisson
Our Giant ZR-1 in the Making
A Reservoir with Cathedral Architecture, An Electron Tube Amplifier Using A. C. Current for Filaments and Plates
Floating a Bridge Into Place Section by Section, Effects of Local Conditions on Radio Direction-Finding and more
Gasoline from Natural Gas
How $200,000,000 a Year is Saved from Waste, and a Billion Gallons Added to the Gasoline Supply
The Physiology of Sweating, Food for Brain Workers and more
Taking the Kinks Out of Our Rivers
How We Can, and Why We Should, Make Our Streams Better Behave Themselves
Twelve Months of Radio
Reviewing the Outstanding Features of the Remarkable Radio Year 1922
Our Army's Helicopter, Variable Surface Wings for Variable Speed Airplanes and more
Irrigation in Australia
The Murrumbidgee Project, with Storage Capacity for 200 Billion Gallons
A Key to Many Industries
The New Technique of Die-Cutting, and the Place It Holds in Our Factories
The Minstrel Frogs
A Few Details About the Source of One of Springtime's Melodies
Powerful Wrecking Derrick for the Virginian Railway, The Sources and Characteristics of the Bacteria in Decomposing Salmon and more
Where British Patents Come From
Something of the History and Present Equipment of the Patent Office in London
Powerful Steam Fire and Salvage Boat, Another Walking Tractor
Fulfilling The Washington Naval Treaty
Scrapping a Fleet of British Dreadnoughts that Fought at Jutland
Harnessing California's Waters
The Completion of the First Stage of the Pit River Power Project
Concerning the Age of the Earth
Some of the Methods of Estimate that Have Been Used, and the Results that Have Been Obtained
Something New in Tubes: The Donle Non-Interfering Detector, A Microphonic Amplifier for Crystal Detector Sets
Short-Time Tests for Long-Time Endurance
How the Testing of Metal for Fatigue Limits is Being Put Upon a Production Basis