vario-couplern.
/ˈvɛːrɪəʊkʌplə/ Obsolete.
A device, consisting of two unconnected coils, one inside the other, whose relative position can be altered to vary the mutual inductance between two circuits.
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coupler1914
vario-coupler1922
optocoupler1973
1922–3 T. Eaton & Co. Catal. Fall–Winter 401/4 Variocouplers, built up on black fibre cylinder, with taps, fitted with lugs.
1925 P. J. Risdon Crystal Receivers & Circuits ii. 21 A vario-coupler..is a sort of combination of a variometer and an ordinary tapped tuning inductance.
1937 Discovery Feb. 54/2 (in figure) Vario-coupler.
This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2020).
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n.1922