This is an extremely rare item used on ships coming from Africa to control, punish and humiliate defiant captured men, women and children slave being transported to American an other parts of the world.
Current study in the TERA Gallery Reading Room relates to this object.
When Europeans arrived along the West African coast, slavery already existed on the continent. African slavery was more akin to European serfdom. In the Ashanti Kingdom of West Africa, for example, slaves could marry, own property and even own slaves. Slavery ended after a certain number of years of servitude. Most importantly, African slavery was never passed from one generation to another.
The first Europeans to come to Africa's West Coast came to trade. The purpose of the exploration was to expand European geographic knowledge, to find the source of prized African gold, and to locate a possible sea route to valuable Asian spices. As time passed this situation took a horrific turn, Africans were either captured in warring raids or kidnapped and taken to port by African slave traders. There they were exchanged for iron, guns, gunpowder, mirrors, knives, cloth, and beads brought by boat from Europe.
"Concerning the trade on this Coast, we notified your Highness that nowadays the natives no longer occupy themselves with the search for gold, but rather make war on each other in order to furnish slaves. . . The Gold Coast has changed into a complete Slave Coast." - William De La Palma Director, Dutch West India Co. September 5, 1705
By the start of the 16th century, almost 200,000 Africans had been transported to Europe and islands in the Atlantic. By 1619, more than a century and a half after the Portuguese first traded slaves on the African coast, European ships had brought a million Africans to colonies and plantations in the Americas and force them to labor as slaves. Trade through the West African forts continued for nearly three hundred years. The Europeans made more than 54,000 voyages to trade in human beings and sent at least ten to twelve million Africans to the Americas.
These shackles served to bind the captive either by the legs at the ankles or the by the hands at the wrists. The slave could not walk with these, so they were installed in the ship.