Zero-Initial-Length Spring
Zero-Initial-Length Spring : A helical spring that is pre-stressed so that the force it exerts in extension is proportional to the distance between the points of attachment, rather than the difference between that distance and the initial length of the spring. Originally developed by L. LaCoste for use in gravimeters, it found important applications in the design of long-period vertical seismographs that can theoretically achieve an infinite period without instability. See: Aki and Richards (2002 or 2009, p. 602-603)
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