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

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