seam (unit)

A seam is an obsolete unit of volume or mass in the United Kingdom

The Oxford English Dictionary{{cite book|title=Oxford English Dictionary|url=http://www.oed.com/view/Entry/174236?rskey=hp6gqX&result=2#eid|accessdate=26 February 2015|chapter=Seam, n.2 (1b and 2)}} includes definitions of a seam as:

• {{convert|6|-|8|imppk|L|lk=in}} of sand
• {{convert|9|imppk|L}} of apples
• {{convert|8|impbu|L|lk=in}} of grain
• {{convert|120|lb|kg}} of glass (or {{convert|100|lb|kg}} in the 14th century)
• a cart-load, sometimes of a specified amount such as {{convert|2|-Lcwt|kg|lk=in}} of straw or {{convert|3|-Lcwt|kg}} of hay or manure.

Cardarelli asserts that it was equal to {{convert|64|impgal|L|lk=in}}.{{Cite book|title = Encyclopaedia of Scientific Units, Weights and Measures|url = https://archive.org/details/encyclopaediaofs0000card|url-access = registration|last = Cardarelli|first = François |publisher = Springer|year = 2003|isbn = 978-1-4471-1122-1|location = London|pages = [https://archive.org/details/encyclopaediaofs0000card/page/34 34]}}