Outstanding Schweigger multiplier or galvanometer by Ateliers Ruhmkorff of Jules Carpentier and from the Polytechnic School collections.
The galvanometer is signed: “Ateliers Ruhmkorff / J. Carpentier. Ingr-Constr Paris / N° 239”
The galvanometer invented by Schweigger in 1820 has the distinction of having a single magnetic needle inside the coil.
In 1825 Nobili had the idea of having two parallel magnetic needles.
The remains of a label on the instrument indicates that it was part of the collection of the Ecole Polytechnique. Furthermore, its unusual elevation suggests that this instrument was specifically designed for the observation during collective demonstration.
Glass and brass part to maintain it are new, otherwise a great original condition.
An unique instrument.
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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.