Wheatstone's rods
Wheatstone's rods Wheat"stone's rods (Acoustics) Flexible rods the period of vibration of which in two planes at right angles are in some exact ratio to one another. When one end of such a rod is fixed, the free end describes in vibrating the corresponding Lissajous figure. So called because devised by Sir Charles Wheatstone. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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