Volume 123, Issue 9
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Features
Gas Engine Versus Steam Engine
The Role Which the Motor Truck Can Play in Transportation, as Indicated by California's Experience
A Neat Problem in Hydraulics
How the Delaware River Was Held at Bay During the Construction of the Naval Drydock at Philadelphia
How a State May Grow a Timber Supply
Varying the Airplane Propeller Pitch, Joseph Norman Lockyer, K. C. B. and more
What Has Been Said About Einstein
A Review of the More Important Popular and Semi-Popular Books and Articles in English
Fire Without Firemen
How the Coal Is Fed Mechanically to the Huge Grates Beneath the Modern Boiler
Oil as a Locomotive Fuel
Wood That Is Stronger Than Steel
How Thin Veneers and Water-Proof Glue Have Conspired to Build a New Industry
Items In Brief
A Department Devoted to Current News in All Fields of Pure and Applied Science