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.| the offspring of a zebra and a donkey. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
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