German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft but the tip of one

but the tip of one mouthpart on the underside is broken (not visible when worn) and it appears to have lost to the very end tip of the wings

then hold the copper handle lightly while pulling the string to get it spinning

Nuanced and unique from every angle

The only flaw on this otherwise excellent condition basket

which research led me to discover was produced by the Grenfell Mission

German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft but the tip of oneI bought this old Placido Disk, or Keratoscope, not knowing exactly what it was, because it reminded me of Duchamp's "Rotoreliefs," and also because I thought it could serve as a great prop for all sorts of things, including perhaps a low budget Sci Fi film! I've since learned that this device, invented in the late 19th century, is an ophthalmic instrument used to assess the shape of the anterior surface of the cornea: a series of concentric rings is