"A colonial windmill was a large and complicated machine built for the
simple purpose of grinding small grains. William Robertson's windmill
closely resembled the one at the Windmill, Cooper, and Rural Trades
Site: a narrow, two-story house balanced on an oak post and fitted with
four 26-foot frames rigged with line sails. When the wind rose, a 20 to
30 mile-per-hour breeze was best, the miller pivoted the house to catch
it."
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