OX POWERED ROMAN SHIP-15 TH CENTURY

THE OX ARE MADE TO GO ROUND AND ROUND A CENTRAL MAST AND TWO SIDE MASTS ,TWO OX PER MAST, AS SEEN IN THE PAINTING ;WHICH ARE CONNECTED TO THE PADDLES OUTSIDE SHIP BY COMPLEX WHEELS AND PULLEYS .[GOOD FOR CALM WATERS AND A LAZY TRIP]