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Henry Blackham's focimeter
OPTOMETRIC INSTRUMENTS
focimeter
Blackham, Henry
Europe: United Kingdom, England, Staffordshire, Wolverhampton
Early 20th c.
wood; brass; glass
overall: 85 mm x 1365 mm x 40 mm

Home-made lens measurement device comprising a brass telescope mounted at one end of a graduated wooden square-section rod, with hand-painted scale and a movable target holder, originally sprung and adjustable via a rope and pulley system (rope missing).


2016.269

Gift of Mr Tony Blackham FCOptom, 2016



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