A close-up view of the spider, a structural brace that helps the Bell support its own weight. Also visible is the wireless transmitter that conveys the signals from the sensors on the crack to the computer that is recording the stresses (black box on top in blue tape) and a MicroStrain G-link sensor that detects rocking motion (black box near lip of Bell).

** Photo Credit: Curt Suplee, National Science Foundation

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