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Rothenaicher's sehprufungsscheiben (discs for examining visual acuity)
TEST CHARTS
near vision test
Europe:
Pre-1920s
card; paper
overall: 130 mm
2015.266
TEST CHARTS
near vision test
Europe:
Pre-1920s
card; paper
overall: 130 mm
Set of two pairs of overlapping rotatable discs bearing Landolt rings visible through an aperture with a single larger ring pasted on the reverse, one pair held together with the other by small fabric looped tag. Together with a 1920s Library envelope overpasted with instructions in German and French.
2015.266