Description acceptable. In one class of these devices, the conversion of AC signals to DC signals causes vibrational rectification error. They're not seismographs, but a type of these devices invented by Lucien LaCoste contain over-coiled springs that behave as if they have (*) "zero-length." Measurement systems consisting of coupled examples of these devices measure a quantity expressed as a 3 by 3 tensor whose components are measured in eotvos (“ert-versh”). Microelectromechanical designs for these devices typically consist of a damped cantilever with a test mass. These devices are the sensors in a car airbag system. The (10[1]-5[2])combination (10[1])of a gyroscope, a magnetometer, and one of these devices (-5[1])compose inertial navigation systems. For 10 points, name (10[1])these (-5[1])devices used in smartphones to (10[4]-5[1])detect shaking and tilting, which (10[1])measure a (10[1]-5[1])quantity with units of (10[1])meters per second squared. ■END■ (10[1])