Description

A large brass liquid prism by Jules Duboscq, used to measure the optical dispersion of liquids, circa 1870.

Brass and steel stand.

Adjustable height and rotating trapezium shaped prism holder, enclosing a glass vessel for the liquid, with cap.

The parallel sides are 23.5 cm and 12 cm. The angled sides are 14 cm.

Signed: Jules Duboscq à Paris

Stamped to the prism holder and stand: U.B C.G

Weight: 7 kilos – 15.3 lbs.

For a similar prism by Duboscq, see: Nineteenth-century Scientific Instruments, Gerard L’Estrange Turner, 1983. Page 149.

Louis Jules Duboscq (March 5, 1817 – September 24, 1886). Traded at rue de l’Odeon 35 (1851) & 21 rue de l’Odeon (1859-85), Paris, France. Apprenticed to Jean-Baptist Soleil (1778 – 1878) in his workshop, 1834 taking over business in 1849. Formed a partnership with Ph. Pellin in 1883.