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Georgian Mahogany Cased Hydrometer Bulbs

Also known as philosophical bubbles or gravity beads. The circular turned wooded box with domed lid opens to a velvet-lined interior with nine numbered glass beads (originally 12). They were used for testing the proof of spirit. The inside of the lid has the remains of a paper label and listed the spirits and their corresponding numbers. They were invented by Alexander Wilson of Glasgow in the 1750s.
British, circa 1750 - 1780
Box Diameter 3” (8cm)
Stock No. 9343

Price: £595.00




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Objects - Clocks & Instruments

Georgian Mahogany Cased Hydrometer Bulbs

Also known as philosophical bubbles or gravity beads. The circular turned wooded box with domed lid opens to a velvet-lined interior with nine numbered glass beads (originally 12). They were used for testing the proof of spirit. The inside of the lid has the remains of a paper label and listed the spirits and their corresponding numbers. They were invented by Alexander Wilson of Glasgow in the 1750s.
British, circa 1750 - 1780
Box Diameter 3” (8cm)
Stock No. 9343

Price: £595.00

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