Abstract
IT has been customary to construct strainmeters within a length range of 5–500 m (ref. 1). Prior to the instruments reported here the longest instrument was a laser strainmeter 1,020 m long2 and the shortest also a laser instrument 1 m long3.
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BILHAM, R., KING, G. & EMTER, D. Kilometre and centimetre Earth strainmeters. Nature 249, 25–26 (1974). https://doi.org/10.1038/249025a0
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DOI: https://doi.org/10.1038/249025a0
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