"The patient lifted himself by the chin which was cradled in a sling attached to ropes looped to an overhead beam."
In 1937, the American Medical Association warned the public that this device, despite being widely advertised, didn't actually work.
The Muncie Star Press - Apr 9, 1937
The inventor of this device was a man named Bernard Bernard who was, himself, only 5 feet 1 inch tall. Details from Hygeia
Another scheme exhibited at the World's Fair was the "Height-Increaser," consisting of a self hanging apparatus with a place for the head and with handles to be gripped with the hands. Fixed to an overhead beam, it was guaranteed to add inches to the growth. The promoter, Bernard Bernard, wrote touching advertisements berating the life of a small man and pointing out that his height-increaser was the road to being a "he-man." He admitted that the apparatus cost him 75 cents, but he sold 3,000 of them for $8.75 each. Bernard, who is only 5 feet, 1 inch tall, explained he had never had the time to increase his own height through his device, although he was then 38 years old.
LA Times - July 31, 1932
LA Times - May 1, 1930