Editing Ounce (section)

=== Historical ===

==== Apothecaries' ounce ====
The [[Apothecaries' system|apothecaries']] ounce (abbreviated ℥<!--({{U+}}2125)-->) equivalent to the troy ounce, was formerly used by [[apothecary|apothecaries]], and is thus obsolete.

==== Maria Theresa ounce ====
"Maria Theresa ounce" was once introduced in Ethiopia and some European countries, which was equal to the weight of one [[Maria Theresa thaler]], or 28.0668 g.<ref>{{Cite book
| last = Greenfield
| first = Richard
| year = 1965
| title = Ethiopia: a new political history
| publisher = F. A. Praeger
| page = 327
| url= https://books.google.com/books?id=T2MFAAAAIAAJ&q=%22Maria+theresa+ounce%22
}}</ref><ref>{{Cite book
| year = 1962
| title = Ethiopia observer
| volume = 6
| pages = 187–8
| url= https://books.google.com/books?id=EfvRAAAAMAAJ&q=%22Maria+theresa+ounce%22
}}</ref> Both the weight and the value are the definition of one ''birr'', still in use in present-day Ethiopia and formerly in Eritrea.{{Citation needed|date=December 2007}}

==== Spanish ounce ====
{{Further|Spanish customary units}}
The Spanish pound ({{langx|es|libra}}) was 460&nbsp;g.<ref>''Diccionario de la Real Academia Española'', 23rd edition, [http://buscon.rae.es/draeI/SrvltObtenerHtml?IDLEMA=45615&NEDIC=Si libra] {{Webarchive|url=https://web.archive.org/web/20110720145109/http://buscon.rae.es/draeI/SrvltObtenerHtml?IDLEMA=45615&NEDIC=Si |date=20 July 2011 }}</ref> The Spanish ounce (Spanish {{lang|es|onza}}) was {{frac|1|16}} of a pound, i.e. 28.75&nbsp;g.<ref>''Diccionario de la Real Academia Española'', 23rd edition, [http://buscon.rae.es/draeI/SrvltObtenerHtml?IDLEMA=82285&NEDIC=Si onza] {{Webarchive|url=https://web.archive.org/web/20110720145123/http://buscon.rae.es/draeI/SrvltObtenerHtml?IDLEMA=82285&NEDIC=Si |date=20 July 2011 }}</ref> It was further subdivided into 16 {{lang|es|[[adarme]]s}} (each 1.8 grams). For pharmaceutical use, the Greek {{lang|es|[[drachm|dracma]]}} was used, subdividing the Spanish ounce into 8 (3.6 grams), due to being equivalent to {{frac|1|12}} of an avoirdupois ounce. In either case, it could be further subdivided into [[Grain (unit)|grains]], each one 49.9 milligrams.

==== Tower ounce<span class="anchor" id="Tower ounce"></span> ==== <!--linked-->
The Tower ounce of {{convert|450|gr|g|abbr=off}} was a fraction of the [[tower pound]] used in the English mints, the principal one being in the Tower of London.  It dates back to the Anglo-Saxon coinage weight standard. It was abolished in favour of the Troy ounce by Henry VIII in 1527.<ref>{{cite book |first=Robert |last=Slater |title=An Inquiry into the Principles involved in the Decimalization of the Weights, Measures, and Monies of the United Kingdom |location=London |publisher=Arthur Hall |date=1855 |page=11 |url=https://books.google.com/books?id=nctVAAAAcAAJ&pg=PA11}}</ref>