Science: Flush Flash

One of the neatest minor inventions of the war, a new signaling mirror, was announced last week by General Electric. Equipped with a sighting device that works on the same principle as a sextant, the mirror can flash a signal flush on a target as far away as ten miles.

Hunting a distant target with sunbeams reflected from an ordinary mirror is a good deal like trying to pin the tail on the donkey. This glass has a full mirror on its face, a smaller circular mirror on its back, and a sighting cross (A)...

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