| 单词 | pith ball |
| 释义 | > as lemmaspith ball pith ball n. a small ball of pith (usually from a tree), esp. one hanging from a thread in an electroscope, which is attracted or repelled by an electrostatically charged object. ΚΠ 1760 Philos. Trans. 1759 (Royal Soc.) 51 317 I fasten the slip of wood, from one end of which the threads &c. hang down five inches, so that the pith balls are about four inches from the table. 1849 H. M. Noad Lect. Electr. (ed. 3) 14 A cylinder of brass, supported on a glass stand, and furnished with a pith ball electroscope. 1935 C. J. Smith Intermediate Physics (ed. 2) v. xxxv. 578 If two uncharged pith-balls are suspended side by side and an electrified rod brought near to them, both are attracted by the rod. 1999 EDN (Nexis) 13 May 28 You can store charged particles in a Leyden jar, or you can watch them attract pith balls, but you can't really do anything with charged particles unless you put them in motion. < as lemmas |
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