Relative Sea Strength of the United States, America's Need for an Aerotechnical Institute and more

The Junkers Oil Engine

A New Type of Motor on the Diesel Principle

Instrumental Observation of the Sun's Heat, Night Letters in Italy and more

The Paris Correspondent of the Scientific American

The Celilo Canal

Burning Up Bad Roads to Make Good Ones, Salving the Steamer "Jose"

Curious Megalithic Monuments of France

Smoke, the Destroyer

The de Lesseps "Wind Wagon", Black Lightning Flashes

The Trade-mark as a Business Asset, Trade-mark Protection.--VIII and more

Military Aviation Abroad

The Paris Correspondent of the Scientific American

Feeding the Body with Electricity