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pendulum chronoscope

Matthias Hipp — Matthäus Hipp also Matthias or Mathias (Blaubeuren, 25 October 1813 – 3 May 1893 in Fluntern) was a German clockmaker and inventor who lived in Switzerland.[1][2] … Wikipedia
Electric clock — An electric clock is a clock that is powered by electricity instead of powered manually or by other sources of energy, specifically in order to wind the mainspring or to drive the pendulum or oscillator. ClassificationThere are actually four… … Wikipedia
Chronometry — (Roget s Thesaurus) >Estimation, measurement, and record of time. < N PARAG:Chronometry >N GRP: N 1 Sgm: N 1 chronometry chronometry horometry horology Sgm: N 1 date date epoch Sgm: N 1 style style era GRP: N 2 … English dictionary for students
chronometry — (New American Roget s College Thesaurus) Science of time Nouns 1. (science of time) chronometry, horometry, chronology, horology; dating, carbon 14 dating; date; epoch, period, era; times. 2. (measure of time) a. calendar, almanac; date; aeon,… … English dictionary for students