Also Twaddel, Twaddle. [Short for Twaddell’s hydrometer, from the name of the inventor.] A form of hydrometer or hydrometric scale in which 200 degrees correspond to a unit of specific gravity, that of distilled water being denoted by zero. Also attrib.
1860. O’Neill, Chem. Calico Print., etc., 11. To obtain the value of any degree of Twaddle, it must be multiplied by five, and the product added to 1,000. Ibid., 12. The specific gravity and the Twaddle value of a degree of Beaumé.
1873. E. Spon, Workshop Receipts, Ser. I. 30/1. A hot solution of nitro-sulphate of iron, 5° Twaddle, 150° Fahrenheit.
