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Figure 31. Ekman current meter invented by V. Walfrid Ekman about 1903. Thisinstrument was distinguished by its original manner for measuring both thestrenth and direction of the current. It was very robust and used throughoutthe world during the first half of the 20th Century. It was first tested in the Skagerrak in 1903 aboard the MICHAEL SARS. (Image credit: Oceanographic Museum of Monaco | Y. Berard)