This chair was tested at sea by the instrument-maker Jeremiah Sisson (son of the more famous Jonathan Sisson) off Ushant in August 1759.
Esisitulo savavanywa elwandle ngumakhi zixhobo zokusebenza uJeremiya Sisson (unyana ka Jonathan Sisson wodumo) ngaphaya kweUshant ngoAgasti 1759.