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£90

SIGHT TESTING INSTRUMENT

  • Date: c 1920
  • Maker: CONVEX
  • Size: LENGTH 10" (26 CM)
SIGHT TESTING INSTRUMENT
SIGHT TESTING INSTRUMENT - Image 1SIGHT TESTING INSTRUMENT - Image 2

Description

The disc is marked COUNT THE DOTS. There are 10 dots in decreasing size. When 10 dots are in focus the disc is locked into place and a calculation is then made from the scale.

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