German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft Signed with what looks like

Signed with what looks like "Jani" and stamped "Brandon Stoneware" - a pottery studio in Brandon

Nuanced and unique from every angle

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

It's seen some use

German Oculus Placido Disk or Keratoscope Opthalmologist Tool antique handicraft Signed with what looks likeI 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