Figure 11. W. F. Ewald's photometer, messenger model, at the end of operation. Invented by Wolfgang F. Ewald about 1910 to fix some of the problems of the previous model. First tested about 1910 off the coast of Scotland. Other tests were then made off Capri.

Image ID: ship4012, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photographer: P. Roggero
Credit: Oceanographic Museum of Monaco

Category: Oceanography/Historical instruments/

• High Resolution Photo Available