Denis Papin was the first who made a model steam-boat. During his residence in England, he was elected Professor of Mathematics in the University of Marburg. At Marburg, in 1707, he constructed a small steam-engine, which he fitted in a boat, "une petite machine d'un, vaisseau ? roues", and dispatched it to England for the purpose of being tried upon the Thames. The boatmen, on the River Weser, thinking it would destroy their occupation, seized the boat, with its machine, and destroyed it. Denis Papin (August 22, 1647 - 1712) was a French physicist, mathematician and inventor. He worked with Robert Boyle from 1676-79, publishing an account of his work in Continuation of New Experiments (1680). During this period, Papin invented the steam digester, a type of pressure cooker with a safety valve. In 1705 he developed a second steam engine with the help of Gottfried Leibniz, based on an invention by Thomas Savery, but this used steam pressure rather than atmospheric pressure. The last surviving evidence of his whereabouts came in a letter he wrote dated January 23, 1712. At the time he was destitute, and it is believed he died that year and was buried in an unmarked pauper's pit.