Jacques Cousteau and Pierre-Antoine was released in 1954. During the 1940s, Cousteau is credited with improving the aqua-lung design which gave birth to the open-circuit scuba technology used today. According to his first book, "" (1953), Cousteau started diving with Fernez goggles in 1936, and in 1939 used the self-contained underwater breathing apparatus invented in 1926 by Commander Yves le Prieur. Cousteau was not satisfied with the length of time he could spend underwater with the Le Prieur apparatus so he improved it to extend underwater duration by adding a demand regulator, invented in 1942 by Émile Gagnan. In 1943 Cousteau tried
New materials in 20th-century art Delaunay and scores of young artists in Paris made their first modern paintings venturing toward abstraction and other new ways of formulating figurative, still-life and landscape imagery. During the first decade of the 20th century modern art developed simultaneously in several different areas in Europe (France, England, Scandinavia, Russia, Germany, Italy), and in the United States. Artists began to formulate different directions of modern art, seemingly unrelated to one another. In printmaking, the linocut was invented by the artists of Die Brücke in Germany between 1905 and 1913. At first they described their prints as woodcuts, which sounded more respectable.