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tumbling weight
tumbling weight n. 
/ˈtʌmbl̩ɪŋ weɪt/,
Brit. /ˈtʌmblɪŋ weɪt/
, /ˈtʌmblɪŋ weɪt//ˈtʌmbl̩ɪŋ weɪt/U.S. /ˈtəmb(ə)lɪŋ ˌweɪt/
= tumbling bob n./ˈtəmb(ə)lɪŋ ˌweɪt/ΘΚΠ
society > occupation and work > equipment > machine > parts of machines > lever > [noun] > weighted
tumbling bob1824
tumbling weight1903
1903 Nature 19 Nov. 68/1 Barney's illustration of the Dudley Castle engine (erected in 1712) was made in 1719, and contains the plug-frame and tumbling-weight device... It is possible that the tumbling-weight had just been added for actuating the steam-valve.
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