Science: Technology Notes

Recent developments of applied science:

¶ A chemical extinguisher which puts out burning magnesium, chief ingredient of incendiary bombs. Hitherto magnesium incendiaries have had to be smothered under buckets or sand heaps (water and common extinguishers only make them burn better). The new chemical, a secret of Pyrene Manufacturing Co., blankets the white-hot magnesium with dense, inert gases. Demonstrated last week before witnesses from the U.S. Army Air Corps, it may be of great value in Britain.

¶ Optical glass made without silica (sand or quartz)—"almost as revolutionary," says Eastman Kodak Co., "as if someone had...

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