Volume 123, Issue 21
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Features
Something Different in Salvaging Operations
Relieving a Wreck of its Cargo with the Aid of Injections of Compressed Air
A Giant Ingot-Mold Casting in the Making
A New Magnesium Alloy for Motor Pistons
Aircraft of the Future
A Statement of What Remains to be Done, and the Directions in Which the Doing Seems to Lie
The Five States of Matter
Two Fundamental Conditions That Must Be Recognized, Besides the Solid, Liquid and Gaseous
Our Coal in the Making
America's Peat Bogs and Their Utilization for Fuel
Taming the River Nile
Construction of Dams and a 225-Mile Canal to Double the Irrigated Area in Egypt