Glass Specific Gravity Bottle with perforated stopper in tin-plate iron case, with counterpoise container in lid [1000 grains], 1840-50. Specific Gravity Bottle with Metal Tin-Plate Case, 1840-1850 1840-1850
Specific gravity bottle and counterweight in fitted mahogany box, mid-19th century. Specific gravity bottle and counterweight in fitted mahogany box