Figure 64. Langevin Florisson echoscope built through collaboration ofProfessor Paul Langevin and Charles Florisson. This instrument was put intoservice in 1933 and used to measure shallow depths from small boats.
4/4/2019 2:12:26 PM
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments