Medical Dictionary
Main Entry:
Rams·den eyepiece Pronunciation:
'ramz-d&n- Function:
noun : a nearly achromatic optical system that contains two plano-convex lenseswith the convex surfaces facing each other and is used especially in instruments fitted with micrometer wires or a scale
Ramsden,
Jesse (1735–1800), British instrumentmaker. Ramsden was a pioneer in the early invention and manufacture of precision instruments. He designed improved, highly accurate sextants and theodolites. He introduced the Ramsden eyepiece in 1779.
