1850-1920, Petrographic Microscopes (by chronological order)

Tourmaline Tongs (c.1860)
Inv. YG-20-010
Hartnack Stand IIIA, 1868
Inv. YG-15-007
Early petrographic, ~1875
Inv. YG-17-011
Thury et Amey à Genève, ~1880
Inv. YG-20-014
Voigt & Hochgesang ~1880
Inv. YG-19-014
Swift & Son "Dick" model, 1891
Inv. YG-19-019
Leitz Wetzlar petrographic, 1909
Inv. YG-20-009
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