Twaddell's hydrometer, Twaddell n. 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.
... of solution, in some factories the use of Baume degrees is preferred, whilst in others Twaddell degrees are the custom, and we have therefore given the two ... — The Handbook of Soap Manufacture • W. H. Simmons
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