Ramsden ocular

Rams·den oc·u·lar

(ramz'dĕn),
an eyepiece of a microscope, consisting of two planoconvex lenses with convexities turned to each other.

Ramsden,

Jesse, English optician, 1735-1800.
Ramsden eyepiece
Ramsden ocular - an eyepiece of a microscope, consisting of two planoconvex lenses with convexities turned to each other.
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