英语词汇“Ramsden”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

Ramsden

/ˈramzdən/

Optics

noun

Attributive and (now rare ) in the genitive. Designating an eyepiece consisting of two planoconvex lenses of equal focal length with their convex surfaces towards each other and a separation less than their focal length.

This arrangement has the focal plane outside the eyepiece, and so lends itself to use with a graticule or cross hairs..

Origin

Late 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. From the name of Jesse Ramsden, English instrument-maker, who described the eyepiece in 1783 (Philos. Trans. (Royal Soc.) 73 94).

单词	Ramsden
释义	Ramsden /ˈramzdən/ Optics noun Attributive and (now rare ) in the genitive. Designating an eyepiece consisting of two planoconvex lenses of equal focal length with their convex surfaces towards each other and a separation less than their focal length. This arrangement has the focal plane outside the eyepiece, and so lends itself to use with a graticule or cross hairs.. Origin Late 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. From the name of Jesse Ramsden, English instrument-maker, who described the eyepiece in 1783 (Philos. Trans. (Royal Soc.) 73 94).
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