gyrograph

gyrograph An instrument for recording revolutions or whirling rotations. Related 'around, round, surrounding' units: ambi-; ampho-; circ-; circum-; cyclo-, -cycle; peri-.
Found on http://www.wordinfo.info/words/index/info/view_unit/946/

gyrograph

instrument for counting a wheel's revolutions
Found on http://phrontistery.info/g.html
No exact match found