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Small Trial Case No 336
TRIAL CASES, FRAMES AND REFRACTOR HEADS
trial case
British Optical Association
Europe: United Kingdom, England, London, W1
c.1914-1934
wood; metal; glass
overall (case): 55 mm x 162 mm x 90 mm

Trial set comprising 13 round lenses only (6 with handles, 3 rimmed but without handles, 4 rimless): Five +/- cylinders to powers of 1.0, 4.0, 5.0, 6.0 and 7.0 (probably the original contents). Contained within wooden case with black velvet-lined hinged lid and hook clasp, labelled inside and on the lid for the British Optical Association. BOA ink stamp on underside of base.


1999.2733

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