Ramsden’s name continues in current usage, whether as the “Ramsden disk” (the exit pupil of a telescope), the “Ramsden eyepiece” (his design, with twin plano-convex lenses, the curves facing each other), or “Point Ramsden” (in present day British Columbia, named by Captain Vancouver on his 1793 explorations). Even a lunar crater bears his name, located at lunar latitude -32.9°, longitude -31.8° And much of his instrumentation has had a long productive life: his (or Troughton’s version of his) dividing
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