Trial case of cylindrical lenses
 Catalogue Number: 1999 Trial case of cylindrical lenses Category: Equipment Sub-Category: Trial lens case Year Of Publication/Manufacture: c1910 Time Period: 1900 to 1939 Description Of Item: Small wooden trial case with hinged lid, two brass hinges & single brass clasp. Lid lined with red satin. Leatherette cover to base. Contains 36 rimless cylindrical lenses, concave & convex, powers 0.25 to 7 Dioptres. Dimensions: L:25.8cm x D:10.6cm x H:5.5cm. Historical Significance: Early trial cases had only spherical lenses. This set was to supplement such a case as cylindrical prescriptions became more widespread. How Acquired: Not known Condition: Very good Location: Archive office. East wall shelves unit 2 |