Volume 129, Issue 1
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Features
Ocean Travel by Combined Steamship and Airplane
Trapping the Burglar
Clever Devices Put Forward by Inventive Genius for Catching the Prowler at His Work
Building the World's Largest Monolith
A Word Regarding the Far-Reaching Significance of Wilson Dam to Navigation and Industry
World Metric Standardization, Ro and more
Uncle Sam's Agricultural Proving Grounds
The Federal Farms Where Problems of Vital Import to American Agriculture Are Investigated
Our First Test Seances
The Report of the Sub-Committee and Some Details of the Sittings
Three Notable Locomotives Which Mark the Trend of Railroading
Are Most Animals Color Blind?
Acrobatic Coal Barges
Our Psychic Investigation in Europe--III
Some Details of a Very Noisy Evening with a Private Psychic Circle in London
Mathematically Perfect Balls of Lead Called Shot
Where Corn is King
Why Our Agricultural Prosperity Depends Largely on Our Annual Hundred Million Acres of Corn
The Fourth Dimension, A New Vitamin Bread and more
When a Bridge Tells its Troubles
A New and Ingenious Device for Measuring the Effect of Traffic on Bridges
Intensity and Duration of Fire
A New Gasoline-Electric Freight Train, Another Cotton Picker and more
Elevation and Range of British Naval Guns
Main Armament of Capital Ships Remains Today as Originally Designed and Constructed
Obelisk-Raising Explained: How the Ancient Egyptian Engineers Employed a Sloping Ramp and a Sand-Pit
Industry in the Philippines
The Golden Opportunity Which this Dependency Presents to American Capital
Fighting the Mosquito
How Minnows, Oil, and Drainage are Freeing Florida of a Leading Enemy of Immigration
Marine Wood Borers at Work, Shop-Made Lawns by the Yard and more
Underpinning the Washington Monument
Enlarging the Foundations to Carry the Five Hundred and Fifty-Foot Shaft
A Canal that Grows Crops in a Barren Country, Harnessing the California River and more
Draining Land With Gasoline
How the Scarcity of Labor has Brought About the Use of Machinery for Marshland Ditching
Concrete in Surprising Places, Poisoning by Illuminating Gas
Solving the Street Traffic Problem
Speeding Up Traffic by Separating the Through and the Local Traffic
Digging in Sacred Soil
Research With the Spade in Palestine Since the War
Sawing Stones With Man-Made Stones
How Abrasives are Employed in Cutting and Shaping Marble and Granite for Building Purposes