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Bishop Harman's Diaphragm Test & test cards
ORTHOPTIC INSTRUMENTS
diaphragm test
Europe: United Kingdom
Post 1909
wood; metal
overall: 80 x 460 x 84 mm

Black wooden instrument. Upper lip rest. White roundel on bar. Diaphragm holder on sprung hinge with round or square options. Test card holder also on sprung hinge at end. Handle removed. Also a set of target cards including text, letters, coloured shapes and pictures.


1999.119

Gift of Dr J.M.L. Howat, Hon FCOptom, 1999



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