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idiometer
idiometer n.
Brit. 
/ˌɪdɪˈɒmᵻtə/
, /ˌɪdɪˈɒmᵻtə/U.S. /ˌɪdiˈɑmədər/
rare (now historical) an instrument for measuring the personal equation of an observer, entailing the observation of the transit of an artificial object whose motion is exactly known.In quot. 1845 used for eudiometer n. (The same page of the source there quoted also has ‘indiometer’, referring to the same thing.)/ˌɪdiˈɑmədər/ΚΠ
1845 Polytechnic Rev. & Mag. 2 263 Oxygen gas..was introduced into the idiometer over mercury, and thirty-five discharges from a Leyden jar passed through it.]
1881 Daily News 19 Sept. 6/2 The idiometer invented by Colonel Walker was adopted by the Indian Survey Department.
2005 Hist. Universities 20 ii. 128 ‘Personal equations’ were the differences between reports of single astronomical phenomena by different observers. (This led to the invention of the ‘idiometer’, a device for discounting such differences.)
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