A pair of French brass and guilloche enamel opera glasses, circa 1900, with maker's mark of Jules Carpentier, the jumelle glasses with folding handle finely decorated with blue enamel, floral sprigs upon a pattern pink guilloche enamel ground, with mark of Jumelle, and Carpentier to the frame, Carpentier was an inventor in the field of optics, pioneering early cinematic cameras as used by the Lumiere Brothers, width 11 cm
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- Guilloche - A form of classical decoration consisting of a repeating ornament of interlacing curved bands, sometimes forming circles, and further decorated with rosettes or other flower forms.
The name is derived from the inventor, French engineer Guillot, who invented a mechanical method of inscribing fine repeating patterns on to metallic surfaces.
On enamelled items with guilloche decoration, the surface is firstly engraved with the repeating pattern, and then covered with several layers of enamel, each of which is fired.
Where the item has not been enamelled the form of decoration is usually called "engine turned".
- Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
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