Specific Gravity Beads

Manufacturer Cesar Altria

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

Density

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

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