BARRETTERS
Noun
barretters
plural of barretter
Source: Wiktionary
BARRETTER
Bar"ret*ter, n. [OF. bareter to exchange. Cf. Barter.] (Wireless
Teleg.)
Definition: A thermal cymoscope which operates by increased resistance when
subjected to the influence of electric waves. The original form
consisted of an extremely fine platinum wire loop attached to
terminals and inclosed in a small glass or silver bulb. In a later
variety, called the liquid barretter, wire is replace by a column of
liquid in a very fine capillary tube.
Source: Webster’s Unabridged Dictionary 1913 Edition