Science: The Path of Progress: Jul. 29, 1940

Every week the U. S. Patent Office grants an average of 770 patents. Among inventions recently patented are:

> Women's shoes which can be raised or lowered by a screw-operated jack in the heels.

> A golf putter equipped with a two-handed grip and a leveling gauge, for easing strain and better sighting.

> A combination policeman's billy and gun.

> A buoyant bathing suit, woven from tubular threads containing tiny, air-filled capsules.

> An apparatus which wakes a drowsing automobile driver by blowing ammonia vapor into his face when he relaxes his grip on the...

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