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rheotome
rheotome n.
Brit. 
/ˈriːə(ʊ)təʊm/
, /ˈriːə(ʊ)təʊm/U.S. /ˈriəˌtoʊm/
now historical an apparatus for periodically interrupting an electric current./ˈriəˌtoʊm/ΘΚΠ
the world > matter > physics > electromagnetic radiation > electricity > electric current > flow of electricity > [noun] > device interrupting
rheotome1843
interrupter1851
chopper1929
1843 C. Wheatstone in Philos. Trans. (Royal Soc.) 133 307 By Rheotome is meant an instrument which periodically interrupts a current.
1912 J. M. Martin Pract. Electro-therapeutics xi. 175 This rheotome is an automatic device with a clock mechanism, and may be set to interrupt the current from 8 to 660 [times] per minute.
2003 T. Philbin 100 Greatest Inventions of All Time lx. 173 In 1868, Julius Bernstein..improved the rheotome by allowing the time between stimulation and sampling to be varied.
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