ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY
Calibrating a hydrophone. Researcher calibrating an underwater microphone, or hydrophone (centre left). The hydrophone tracks sea animals that have been previously tagged with an acoustic transmitter by picking up the transmitter's sounds as a series of 'pings'. This enables the researcher to determine the animlals' approximate location and depth. Photographed at the National Physical Laboratory, in Teddington, UK.
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