What this unit was
British beer pin (4.5 imperial gallons) is modelled here as a liquid standard of the British beer cask tradition, associated with United Kingdom during Nineteenth to early twentieth-century trade standard. The converter represents one pin as 20.457405 L; its basis is historical-imperial-gallon-count. This is a defined or exact matrix anchor.
Within that setting, the unit belonged to a working system for storage, rations, trade, and the circulation of drink or other commodities. It should be read with its period, locality, and evidential basis attached, not as a universal value shared by every culture using a similar name. A vessel name is not automatically the capacity of every surviving vessel.
Evidence of use and sources
The working value is traceable to US Government historical British cask table. Its record is classified as high confidence and uses the stated basis rather than an assumed culture-wide constant.
Three directly pertinent excerpts from the supplied library are available.
“the use of grains of corn as a means of expressing small weights is very ancient”
British weights and measures as described in the laws of England from Anglo-Saxon times, PDF p. 22. small-weight practice
“Avoir de poiz weight is to be used for other commodities, for Merchandize, and for Grocers.”
A dictionary of weights and measures for the British Isles, PDF p. 51. commodity trade
“every barrel for ale shall contain xxxii. gallons”
A dictionary of weights and measures for the British Isles, PDF p. 61. regulated cask capacity
Working definition
British beer pin (4.5 imperial gallons) is represented as a British beer cask standard associated with United Kingdom during Nineteenth to early twentieth-century trade standard.
The converter uses 20.457405 L per unit.
How to use it
Basis: historical-imperial-gallon-count; confidence: high. A shared historical name does not make this value portable to another period or polity.
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