Nicholson hydrometer

unsigned (French)
Areometer (cylinder diameter: 4.4 cm) made of sheet iron and lead cone, both enamelled blue. In cylindrical can enamelled blue and gold (diameter: 7.5 cm, length: 29 cm), paper label with the written text "Aréomètre de Nicholson".
French, unsigned, middle of 19th century.

private collection