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For accurate measurement of the radius of curvature of spherical lenses. Three-pronged brass table with three pointed legs carries a vertical main scale from -10/10mm on one of the prongs, and a micrometer scale on a brass disc with 100 divisions. The table has a screw at its center with a pitch of 1mm, giving a LC of .01mm but with a heavier, circular table instead of three prongs. Flat glass plate also included for zero adjustment. With instructions.