Tierce

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See Tierce (fencing) for the manoeuvre in that sport.

The tierce is an old English unit of wine casks, holding about 159 litres. From 1824 on it was defined by English law to be 35 imperial gallons, before that (and still in the USA) it was 42 wine gallons—the difference being less than tenth a percent. It is closely related to the modern petrol barrel.

Tierce is also an open-source content management system for small websites, and can be downloaded here.

Tierce is the french word to use for 'third' as in 'third person' or 'third party' and in music theory for a third interval.

English casks of wine [1]

gallon	rundlet	barrel	tierce	hogshead	firkin, puncheon, tertian	pipe, butt	tun
							1	tun
						1	2	pipes, butts
					1	1+1⁄2	3	firkins, puncheons, tertians
				1	1+1⁄3	2	4	hogsheads
			1	1+1⁄2	2	3	6	tierces
		1	1+1⁄3	2	2+2⁄3	4	8	barrels
	1	1+3⁄4	2+1⁄3	3+1⁄2	4+2⁄3	7	14	rundlets
1	18	31+1⁄2	42	63	84	126	252	gallons (US/wine)
3.79	68.14	119.24	158.99	238.48	317.97	476.96	953.92	litres
1	15	26+1⁄4	35	52+1⁄2	70	105	210	gallons (imperial)
4.55	68.19	119.3	159.1	238.7	318.2	477.3	954.7	litres