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Small Scale Gold Mining Equipment And Process

Windexchange small wind guidebook beaufort scalea scale of wind forces described by name and range of velocity and classified from force 0 to 12 with an extension to 17 the initial 1805 francis beaufort wind force scale of 13 classes 0 to 12 did not reference wind speed numbers but related qualitative wind conditions to effects on the sails of a frigate then the main ship of the royal.

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