Figure 19. Closing device for Chun and Petersen net first devised by Giuseppe
Palumbo, commanding officer of the VETTOR PISANI. In the course of its around
the world oceanographic cruise of 1882-1885, the idea to develop a helical clos
ing device for a towed plankton net was developed. Prince Albert I of Monaco
adapted this idea to a vertical net during the expedition of 1887.