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![Figure 4 ship4374.jpg Figure 4](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4374.jpg?itok=v2wz9z5k)
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Figure 4. Stevenson dynanometer, designed by the Scotch engineer ThomasStevenson in 1843. This instrument measured the pressure exerted by waves on avertical surface. He used this instrument to measure the pressure of waves atthe lighthouse at Skerryvore where pressures close to 30 tons per square meter were observed. (Image credit: Oceanographic Museum of Monaco | Y. Berard)