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The rise in popularity and the promotion of round barns occurred surrounding the new focus on efficiency. The circular shape has a greater volume-to-surface ratio than a square shaped barn. Regardless of size, this made round barns cheaper to construct than similar sized square or rectangular barns because they required less materials. The structural stability is also enhanced over that of a typical quadrilaterally shaped barn. Simplified construction lacking elaborate truss systems for the arched roof was also seen as an advantage. In the Midwest, particularly, the buildings were thought more resilient against prairie thunderstorms.[4] The interior layout of round barns was, at the time, promoted as more efficient, since farmers could work in a continuous direction.[1] In the days before mechanization, labor-saving features were a big selling point.
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