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15) Ship pulley

A late-1700s pulley crafted from two woods vital to the shipping industry. The housing is made from live oak—an extraordinarily hard wood traditionally used for ship sheathing. It was so resilient that when cannonballs bounced off the USS Constitutions sides during a battle, the enemy thought she had “iron sides.” The pulley is made of lignum Vitae—a ferociously hard wood with extremely high resin content and self-lubricating properties—that was used for propeller shaft bearings on ships and submarines up through WWII.

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