A quite rare example of a brass silvered protractor superbly signed “Butterfield à Paris”. We can date if from the late 17th century or circa 1700.
The early scientific instruments silvered are particulary rare in reason of the silvering technic which was not common and not easy to apply before the chemical and electrolyse technics from the 19th century.
Here, the brass was silvered by laminating, ei by application of silver sheets by burnishing or with mercury, or with silver powder.
Futhermore, the silvering is very well preserved, is deep and thick but irregular.
The marks of wear which reveal the brass beneath the silver plating seem to indicate quite clearly that the application of silver is old and not modern.
A rare survival and here extremely well preserved.
Size : 10,1 x 6,8 cm
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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.