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Priestley Smith fusion tubes
ORTHOPTIC INSTRUMENTS
fusion test
Bailey, R.
Europe: United Kingdom, England
c.1898
metal; glass
tube: 60 x 30 mm

Binocular testing instrument consisting of two black metal tubes chained together, each tube with a biconvex eyepiece lens and coloured filter (one red, one green).


2003.141

Gift of Mr J.F. Hunt, 1930



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