It was a steel pole about eight feet tall, stuck in the ground. At the top a rotating hoop about two feet in diameter, with four or five steel chains equally spaced around the circumference of the hoop. The chains hung down and had forged steel handles at the end three or four feet off the ground.
In it's normal mode of operation, a group of kids would hold on to the handles and run around the perimeter, jumping off the ground occasionally and swinging out.
What we discovered pretty quickly, was that if to start, one crossed one's chain over the chain of the person behind oneself. Then, when one went to jump out and swing, one would fly up and over/across the back of the person in front. And the physics of this machine were such that even though one was following no more than two or three feet behind the person ahead of oneself, when one did make their jump, the tension on the chain would take up quickly enough that one need not worry about flying into their cohort who had allowed them to cross chains. It was a clean launch, with not so much as a brushing past of the person in front.
Isn't there an expression to the effect of, "if one is good, then two must be better"? Well, as ten-year-olds, that was the prevailing theory we were working from at the time, anyway. The common sense wisdom that warns about "too much of a good thing," is wisdom that comes with age and experience. But we were young and invincible. So one day I decided to cross two chains.
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