 When in 1905 the Grande école was transformed into the University of Belgrade Petrović was among first eight regular professors, who elected other professors.He patented total of 10 inventions, published 300 scientific works and a number of books and journals from his sea expeditions.These expeditions included trips to Azores, Newfoundland and Labrador, Suez Canal, Madagascar, Cape Verde, Canary Islands, Greenland, Iceland, Bermuda Triangle, Caribbean and others.