TEK IMAGE / SCIENCE PHOTO LIBRARY TEK IMAGE / SCIENCE PHOTO LIBRARY
Weighing scales. Mechanical spring scales consisting of a platform (top centre), a face (left) and pointer (centre left). The scales are calibrated to kilograms (red) and stones (black). When the subject stands on the platform, a spring is compressed or stretched to balance the load. The needle is moved around the face in accordance with the stretching or compression of the spring. Scales such as these are often found in homes, clinics and hospitals.
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