Robert F Young's "The Servant Problem" (novelette, first contact, free): When servants thought they were masters!

Village idiot is also the village inventor. When he mysteriously received plans for a knot-tying machine on an April Fool's Day, he had to build that machine. And what kind of knots did it tie!

Fact sheet.

First published: Analog, November 1962.
Download full text from Project Gutenberg.
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Rating: B.
Among the stories from Astounding/Analog issues edited by John Campbell.
Related: Stories of Robert F Young.