
Progress and the Telephone

Progress and the Telephone

Lightning, Benefactor of Mankind, New Paint Resists Corrosion and more

Large-Scale Insect Trapping, Synthetic Ham—What Next and more

Easy Way to Melt Snow Blanket in Spring, Tracer Shotgun Sheil and more

Teach Deaf and Dumb Children with Gas, Wire Cable Static Absorber and more

Preparedness for Peace

Huge Lodestone Specimen, Einstein, Living Immortal and more

Now You Can Buy Insects for 10 Dollars a Million, New Photo Flash Lamp and more

Movie Camera as an Aid in Testing, Fire War on Pests and more

Water Runs from Marathon to Athens

Direct-Reading Light Intensity Meter, Fireproof Houses in France and more

Manhattan's Mightiest "Minaret"
Many Unique Features and Engineering Problems Involved in Building the World's Tallest Structure

The Detroit River Is Spanned
At An Extremely Important Point, Economically, a Beautiful Bridge at Detroit Has Largest Span in the World

Your 1930 Car
A Survey, in Brief, of Developments, Improvements, and Changes in Design of Some of the Better Known Cars

Ford's Friend Edison
Mr. Ford Talks of Mr. Edison, of Industry, of Youth, and of the Inspiration of Edison's Achievements Which He Is Commemorating at Dearborn

Where the River Shannon Flows
A Huge Hydro-electric Plant, Being Built on This Great River, Will Add Greatly to Ireland's Power Supply

Our Latest Peace Insurance
With World War Experience As a Guide, Ordnance Experts Prepare, Not For, But Against Another War

Youth Hankers to Fly
Tired of Being Earth-bound, Many Young Men Are Learning to Fly at Uncle Sam's Expense

Is Concrete Better than Cross-ties?
Test Section of Rigid Roadbed, Used a Year, Shows Superiority Over Ballasted Track

Pulverized Coal Goes to Sea
Trial Trip of Shipping Board's Freighter, Converted to Use This Fuel, Is a Success

Faster Motor Boats
Tests Show That New Invention, Attached to Motor Boat, Gives Greater Speed