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tumbling-trough
tumbling-trough n. 
/ˈtʌmbl̩ɪŋtrɒf/, /ˈtəmb(ə)lɪŋˌtrɑf/ in sulphuric acid manufacture, a receptacle which pours nitric acid from each of its two balancing chambers in turn ( Cent. Dict. 1891).
Brit. /ˈtʌmblɪŋtrɒf/
, /ˈtʌmblɪŋtrɒf//ˈtʌmbl̩ɪŋtrɒf/U.S. /ˈtəmb(ə)lɪŋˌtrɔf/
, /ˈtəmb(ə)lɪŋˌtrɔf//ˈtəmb(ə)lɪŋˌtrɑf/<
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