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57.0 MB (5.8 MB compressed)
3984 x 5000 pixels
33.8 x 42.4 cm ⏐ 13.3 x 16.7 in (300dpi)
PAUL RAPSON / SCIENCE PHOTO LIBRARY PAUL RAPSON / SCIENCE PHOTO LIBRARY
Ultrasonic testing of the walls of high-pressure gas cylinders. The technician is holding a transducer against the side of a cylinder. The transducer passes high-frequency sound waves through the metal and picks up any echoes. This allows the technician to assess the thickness of the cylinder wall, and to check for any defects.
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