Jean Cras

Jean mile Paul Cras was a 20thcentury French composer and career naval officer. His musical compositions were inspired by his native Brittany, his travels to Africa, and most of all, by his sea voyages. As a naval commander he served with distinction in the Adriatic Campaign during World War I.

Cras was born and died in Brest. His father was naval medical officer. He was accepted into the navy at the age of seventeen. As a midshipman cadet on the Iphignie, he fought in the Americas, the West Indies and Senegal. He was promoted to Lieutenant in 1908. His mathematical skills led to his proposing a number of innovations in technical practices which were adopted by the navy, including his invention of an electrical selector and a navigational plotter protractor .

Source: Wikipedia