The Collaborative International Dictionary
Noematachograph
Noematachograph \No*e`ma*tach"o*graph\, n. [Gr. no`hma the
understanding + ta`chos swiftness + -graph.]
An instrument for determining and registering the duration of
more or less complex operations of the mind.
--Dunglison.
Wiktionary
noematachograph
n. (context dated English) A precise time instrument, used to measure the duration of various cognitive tasks.