from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics Any pendulum having a
periodequal to that of a hypotheticalpendulum whose length is equal to the Earth's radius(84.4 minutes); its arm will remain locally verticalwhen the pivotis moved and is therefore the basis of navigational instruments
from Wiktionary, Creative Commons Attribution/Share-Alike License
From Max Schuler German physicist
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