| 单词 | proof plane |
| 释义 | > as lemmasproof plane proof plane n. (a) a small flat conductor with an insulating handle that is used to measure the electrical charge of a body by picking up the charge when placed in contact with the body and transferring it to a measuring instrument; (b) an object with an optically flat surface (cf. optical flat n. at optical adj. and n. Compounds); a surface for use as a standard of flatness. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > [noun] > conductor > used in measurement proof plane1836 1836 Philos. Trans. (Royal Soc.) 126 435 The electricity of the given point he [sc. Coulomb] considered as transferable to a small insulated disc, first applied to the body, and subsequently placed in his balance. The insulated disc has been termed a proof plane. 1919 Proc. Royal Soc. A. 96 268 In the case of an unlimited sheet of cloud or shower illuminated by the sun, the brightness of the proof-plane, if it faces the source of light, is always constant. 1964 J. F. W. Galyer & C. R. Shotbolt Metrol. for Engineers ii. 23 The beam is turned through 90° and directed to the proof-plane C, the lower surface of which is coated with a semi-reflecting film of aluminium. 2001 Jrnl. Electrostatics 51–2 105 The contact charge exchange between metals and these polymers were measured using a proof-plane that was connected to the input of the electrometer. < as lemmas |
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