One of the mysteries of the English language finally explained.
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.
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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