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The one-horse shay is a light, covered, two-wheeled carriage for two persons, drawn by a single horse. The body is chairlike in shape and has one seat for passengers positioned above the axle which is hung by leather braces from wooden springs connected to the shafts.
The one-horse shay is an American adaptation, originating in Union, Maine, of the French chaise. The one-horse shay is colloquially known in the US as a 'one-hoss shay'.
A smaller and more lightly constructed version of the one-horse shay is called a chair or 'whiskey' because it can "whisk" around other carriages and pass them quickly.
American writer Oliver Wendell Holmes Sr. memorialized the shay in his satirical poem "The Deacon's Masterpiece or The Wonderful One-Hoss Shay". In the poem, a fictional deacon crafts the titular wonderful one-hoss shay in such a logical way that it could not break down. The shay is constructed from the very best of materials so that each part is as strong as every other part. In Holmes' humorous, yet "logical", twist, the shay endures for a hundred years then it "went to pieces all at once, and nothing first, — just as bubbles do when they burst". It was built in such a "logical way" that it ran for exactly one hundred years to the day.