A Jules Duboscq brass colorimeter, French, late 19th century, signed Mon. Jules Duboscq Ph.Pallin Paris, with shaped brass frame, prism housing surmounted by eyepiece, two faceted glass columns with duel adjustment by rack and pinion on a 120mm engraved scale, on cast iron base with adjustable reflector, 20½in (52cm) high Fußnoten Invented by Jules Duboscq in 1870, colorimeters are used to determine the concentrations of substances by measuring colour intensities. The Duboscq type of colorimeter works by comparing the colours of two solutions of a coloured substance, a standard with a known concentration, and a sample with an unknown concentration. A clear crystal prism dips into each solution and may be adjusted so that the path lengths of the light through the two solutions can be adjusted. The instrument then takes the light from the two prisms and arranges it to form two halves of an illuminated field in the viewing telescope. Ph. Pellin became a partner of Jules Duboscq in 1883 and carried on the business after 1886.
A Jules Duboscq brass colorimeter, French, late 19th century, signed Mon. Jules Duboscq Ph.Pallin Paris, with shaped brass frame, prism housing surmounted by eyepiece, two faceted glass columns with duel adjustment by rack and pinion on a 120mm engraved scale, on cast iron base with adjustable reflector, 20½in (52cm) high Fußnoten Invented by Jules Duboscq in 1870, colorimeters are used to determine the concentrations of substances by measuring colour intensities. The Duboscq type of colorimeter works by comparing the colours of two solutions of a coloured substance, a standard with a known concentration, and a sample with an unknown concentration. A clear crystal prism dips into each solution and may be adjusted so that the path lengths of the light through the two solutions can be adjusted. The instrument then takes the light from the two prisms and arranges it to form two halves of an illuminated field in the viewing telescope. Ph. Pellin became a partner of Jules Duboscq in 1883 and carried on the business after 1886.
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