The hairspring of a watch weighs but one-twentieth of a grain per inch. One mile of such wire would weigh less than half a pound.
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Bibliographic details
Auckland Star, Volume LXII, Issue 69, 23 March 1931, Page 10
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25Untitled Auckland Star, Volume LXII, Issue 69, 23 March 1931, Page 10
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Acknowledgements
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