Jean le Rond d'Alembert (1717-1783) an important figure in the history of science. A mathematician and encyclopedist, he collaborated with Diderot on La Grande Encycopédie, writing the Discours Préliminaire which was its introduction and contributing many articles to the work. His researches in hydraulics resulted in a discovery known as the D'Alembert paradox. The present volume presents the results of towing-tank tests on ship model drag.