Bone Stress
A human thigh bone (a femur that has been cut in half along its length) is displayed next to a clear plastic model of the same bone. The plastic femur can be put under the same type of loading stress that it would experience in the body by pulling down on a lever. The stress patterns in the plastic bone are made visible because the bone is mounted in front of a light between crossed polaroid material. Stress patterns in the plastic bone can then be seen to approximate the internal strengthening structures in the real bone.
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