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Trial-Sight / Apparatus for testing the presence of Astigmatism & case
OPTOMETRIC INSTRUMENTS
astigmatism test
R. & J. Beck
Europe: United Kingdom, England, London
c.1866
brass; horn

Instrument consisting of a brass mount with horn rim, into which are plugged two adjustable lens holders. Features an adjustable slit with metric and imperial scales. Also revolving disc bearing four pinholes. Brass stem and table clamp. Contained within red morocco leather hinged case. Two hook clasps. Lined with blue velvet and silk. Gold inscription on silk.


1999.3054

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