♫ – OFF TOPIC – Trzy wieki wykorzystania pary. (część 10. Parowce)

.https://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/De_Rebus_Bellicis%2C_XVth_Century_Miniature.JPG/640px-De_Rebus_Bellicis%2C_XVth_Century_Miniature.JPG

XVth century miniature of an ox-powered paddle wheel boat from the 4th century Roman military treatise De Rebus Bellicis by Anonymous. Original document held at Bodleian Library, Oxford.

.https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Anonymous_of_the_Hussite_Wars._Clm_197%2C_Part_1%2C_Folio_17v_Supra.jpg/800px-Anonymous_of_the_Hussite_Wars._Clm_197%2C_Part_1%2C_Folio_17v_Supra.jpg

A 15th century paddle-wheel boat whose paddles are turned by single-throw crankshafts. Source: so-called „Anonymous of the Hussite Wars”