The only known proportional dividers in nickel silver for 3th-dimension objects, circa 1850-1860.
€3,500
Circa
1860
Country of manufacture
UK and Ireland
Description
Length : 24cm, width : 1,7cm ; thickness : 1,8cm.
These proportional dividers, made in nickel silver, have an uncommon shape, which seems unrecorded by specialised bibliographies. We did not manage to find any illustration in modern and contemporary literature.
The instrument has four arms, two of which, on the same side, are folding. The instrument seems to be used to reduce measurements of objects in three dimensions: the more one bends/curves the foldable arms, greater is the reduction.
Furthermore, the folding arms can be bent to different degrees, which could allow to use this dividers as a four-legged instrument.
This instrument is exhibited at the NY antiquarian book fair at the Park Avenue Armory from 27-30 April.
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Dealer information
Le Zograscope
Established by Alexandre Piffault in 2014 and based in Paris at 5 rue de Condé, 75006, very close to Odéon, 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.
Personnal website : https://www.lezograscope.com/
