Regnault's measuring cylinder and specific gravity bottle, 19th century.
© Science Museum / Science & Society Picture Library
The measuring cylinder, for measuring varying amounts of liquids, is graduated to 100 cc. The specific gravity bottle has just one accurate marking of 1000 grains. When the liquid inside is weighed, its density can be calculated. The bottle was developed by Henri Victor Regnault (1810-1878), a French chemist and physicist.