Lot · Optical
Magnifier Optical Tool, Tri-Fold Linen Tester / Biology / Charts, circa 1870
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Mon · Jul 6, 2026
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ZIP 341**
harmic.little
5,866 ratings · 100.00% positive
Description
From the sellerIt can then be used as a hand held magnifier that can be freely moved over the area. It is in excellent condition. In the 19th century, such a magnifier was referred to as a “linen tester” for textile workers to count fabric threads and stitches while sewing, embroidery, and lace making.
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