Figure 10. W. F. Ewald's photometer. Vibration model activated by shaking thecable that the instrument was attached to. This model was invented by WolfgangF. Ewald in 1910 and tested near the coast of Scotland.
4/4/2019 1:50:12 PM
Photographer: P. Roggero
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments