opisometer

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opisometer

(ˌɒpɪˈsɒmɪtə)
n
an instrument used to measure curved lines on a map
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive
The length of flow path followed by each streamline was measured with an opisometer, and hence the travel time required for it to reach the drain was calculated.
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