beaker, n.¹ — Green’s Dictionary of Slang

beaker n.¹

[SE beaker, a large drinking-vessel with a wide mouth, a goblet]

(UK Und.) a silver tankard.

1718		C. Hitchin Regulator n.p.: Wadge alias Beaker alias Silver-Tankard.
1768		(con. 1710–25) Tyburn Chronicle II in Groom (1999) xxix: A Beaker A Silver Tankard.
1786		Whole Art of Thieving .
1876		C. Hindley Life and Adventures of a Cheap Jack 99: They each dipped their beakers in, and as soon as they emptied their jugs they were soon filled up again.