Bible Dictionaries
Twaddell's Hydrometer
Webster's Dictionary
A form of hydrometer for liquids heavier than water, graduated with an arbitrary scale such that the readings when multiplied by .005 and added to unity give the specific gravity.
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Bibliography Information
Webster, Noah. Entry for 'Twaddell's Hydrometer'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/twaddells-hydrometer.html. 1828.