Michel-Lévy comparator for petrographic microscopes by Nachet – circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885
  • Michel-Lévy comparator for petrographic microscopes by Nachet - circa 1885

Michel-Lévy comparator for petrographic microscopes by Nachet – circa 1885

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Dimensions

Comparator : 14 cm ; box :15x10x6,5 cm

Circa

1885-1890

Category: Microscopy

Description

A very good example of an early Michel-Lévy comparator apparatus, signed Nachet, used for determining the double refraction of minerals : a pioneered microscopical accessory who uses the birefringence to identify minerals in thin section with a petrographic microscope.

This very technical and petrographic/polarizing apparatus was presented for the first time in 1883 par Auguste Michel-Lévy in his paper “Mesure du pouvoir birefringent des mineraux en plaque mince” (pages 143-160 in Bulletin de la Société Minéralogique de France, Tome Seizième, Paris, La Sorbonne, 1883 ; http://jubilotheque.upmc.fr/fonds-mineralogie/GH_000515_001/document.pdf?name=GH_000515_001_pdf.pdf : see especially the page 148 with the rare first figure of the comparator by Michel-Lévy himself).

With this kind of petrographic instruments, Michel Lévy will succeed in establishing his important birefringence chart (today called Michel-Levy birefringence chart).

Build and sold by Nachet, the comparator appeared for the first time in the 1886 Nachet Catalogue (page 24-25, number 25).

The present example is complete with its optics, prisms and quartz wedges, and in its original very good condition with its original patina.

Only the scale is a little bit riddled and the box insolated, but the red velvet inside is in perfect condition.

A very important instrument for the French petrographic microscopy. Rare in such condition.

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FR Le Zograscope

Established by Alexandre Piffault in 2014 and based in Paris, Le Zograscope specializes in antique and rare books in Science, Medicine and Technology, and rare antique instruments in the same fields. We have especially a strong interest in early and continental microscopy, early and special mathematical/drawing instruments, medical and surgical instrument, and rare technology.

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