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Image Not Available for Specific Gravity Beads
Specific Gravity Beads
Image Not Available for Specific Gravity Beads

Specific Gravity Beads

Manufacturer
Datec.1860
Object NameBead
Mediumglass, wood, paper
ClassificationsMetrology
DimensionsOverall (Height x Diameter): 34 × 86mm
AcquisitionRussell Bell Bequest, 1945
LocationView by Appointment - Aberdeen Treasure Hub
Object numberABDMS010433
Keywords
About MeThese philosphical beads were used to indicate the specific gravity of alcohol and thus determine its proof. The business of Cesar Altria started as "glass blower" but expanded to include his son. By the 1850s Atria was advertising himself as "Optician to the Queen".

Round wooden box with lid containing 12 specific gravity beads for measuring the strength of alcohol. Each bead sits in a recess in a dark blue or black felt insert. Each bead is etched with a number, which is repeated on a circular paper label next to each bead - the number are from 20 to 32 (except 31).

A paper label inside the lid reads:

BEADS for proving SPIRITS,
Adjusted in the most accurate man-
ner. - The Beads will sink to the
bottom of the Glass, if proof.
Made by C. ALTRIA, Glass-blower,
Long Acre, Aberdeen.
Spirit of Wine,...........18, 19, 20, 21
Double Whisky,........22, 23
Double Rum,............24, 25
Double Gin and Brandy,26, 27
Proof,.......................28,29,30
Glass Proof,.............31,32,34