'Twaddell's hydrometer' definitions:

Definition of 'Twaddell's hydrometer'

From: GCIDE

Twaddell \Twad"dell\, n., Twaddell's hydrometer \Twad"dell's hy*drom"e*ter\ [After one Twaddell, its inventor.] 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. [Webster 1913 Suppl.]