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United Kingdom of Great Britain and Northern Ireland
Design of the flag
According to Barraclough's Flags of the World, it's not clear whether the white fimbriation should be taken from the blue background or from the crosses. In the first case the red is wider than in the second case.
Mark Sensen, 25 September 1995
If the St Patrick's Cross was centred on the St Andrew's Cross, then it would look like Andrew was just a fimbriation for Patrick. In reality, they are equal, and so you will note that the thin white stripe next to the St Patrick's Cross is a fimbriation, whereas the Saint Andrew's Cross of course needs no fimbriation. Why the anticlockwise attitude of St Patrick vis-à-vis St Andrew? Because The St Andrew's Cross, representing Scotland, the older member of the United Kingdom, comes before Saint Patrick for Ireland, a younger addition. And so the Saint Andrew's Cross is first when we start in the canton and move downwards.
Robert M. J. Czernkowski, 20 November 1995
The official specification is based on 1/30ths of the width (or height) of the flag. The St George's Cross is 6/30ths (1/5th) of the width, the fimbrations to it are 2/30ths (1/15th) of the width. The St Andrew's Cross is a total of 6/30ths (1/5th) of the width, measured perpendicularly to the diagonal. This is made up, in the top hoist corner, top to bottom, of 3/30ths white, 2/30ths red, 1/30th white. These dimensions apply regardless of the length of the flag. An accurate drawing of the flag can be found at this page, or on our page here.
My sources tell me that the proportions of Royal Navy flags were set at 1:2 for ensigns and jacks, and 2:3 for command flags " early in Queen Victoria's reign". Can anyone supply me with the actual date? The general consensus of opinion (backed by the measurements of the one surviving ensign I am aware of) seems to be that this was a confirmation of a situation which had been extant since the last quarter of the 18th Century?
Christopher Southworth, 18 April 2003
My impression is that there was no particular date. I think it happened as a matter of practical convenience when, probably about the middle of the 19th century, or a little earlier, the dimensions of naval flags stopped being expressed in 'breadths x yards', and changed to 'feet x feet'. 1 : 2 just happened to be the ratio that, at the time, most nearly expressed the relative size of a breadth to half a yard, and was adopted without any specific instruction. The Admiralty Flag Book of 1889 is not precise: "The practice has been, in regard to the dimensions of flags generally, to make the length twice the breadth at the head. The following appear to be exceptions to this rule. Admiral, length is one and a half times breadth."
David Prothero, 18 April 2003
However, the army's version of the flag is not 1:2 but 3:5, so the two values of 25 along the bottom edge would be 20. In this case the diagonals of the St Patrick's cross are not quadrilaterals and are cut off as shown above. This is not a mistake - it is simply a result of the geometry. Both the 1:2 and 3:5 versions are official (although the government uses 1:2) and their specifications are given in BR20 Flags of All Nations, the British government's flag book.
There are other versions of the Union Flag: Queen's Colours are usually almost square and have very narrow fimbrations, with the red and white parts of the diagonal being of equal width; Queen's harbourmaster has a central Union Flag which is longer than 1:2; jacks for ships carrying blue ensigns are square and have a square Union Flag in the canton, etc.
Graham Bartram, 1 and 7 December 1999
The origin of the St. Patrick's cross introduced into the Union Jack in 1801 is a bit of a mystery. It appears that until the St. Patrick's cross was added to the Union Jack, there was no acknowledged St. Patrick's cross flag, certainly not one that was acknowledged in any form as a national flag for Ireland.
Mike Oettle, 15 December 2001
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