| http://www.w3.org/ns/prov#value | - There were versions of the Beaufort scale for landsmen in which the wind might be measured by its effect on a leaf or the smoke rising from a chimney, and of course there was a version which allowed the common sailor to read the wind by its effect on the sails of his ship.One of the interesting things in making our weather vanes was finding the balance point, the point at which the shaft of the va
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