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OPTOMETRIC INSTRUMENTS
instrument (part)
Europe: United Kingdom
Mid 20th c.
glass; metal
overall: 43 mm x 50 mm
2011.720
instrument (part)
Europe: United Kingdom
Mid 20th c.
glass; metal
overall: 43 mm x 50 mm
Component of a larger optical instrument, comprising a glass cylindrical bulb unit with metal element and inlet tube. One end translucent with marked grid pattern, the other end clear.
2011.720
Gift of the Marton Library Trust, 2011