In Great Britain, 20th century, a sheet metal gauge (the hoops referred to are those that bind the staves of barrels). Legalized by an Order in Council of 10 July, 1914, and became operational in 1 November 1914. Also known as the Birmingham Gauge. It is an adaptation of the South Staffordshire “B.G.”, issued on 1 March 1884 by the South Staffordshire Ironmasters' Association, with the sanction of the Board of Trade. That in turn was a formalization of standards previously used in South Staffordshire only for sheets and hoops. It is NOT the Birmingham Wire Gage.
A modern version (more decimal places for the thinner gages) of the Birmingham sheet metal gauge is given here.
| Gauge | Thickness in inches 1914 |
South Staffordshire Ironmasters 1884 |
South Staffordshire pre-1884 |
|---|---|---|---|
| 15/0 | 1.0 | — | — |
| 14/0 | 0.9583 | — | — |
| 13/0 | 0.9167 | — | — |
| 12/0 | 0.8750 | — | — |
| 11/0 | 0.8333 | — | — |
| 10/0 | 0.7917 | — | — |
| 9/0 | 0.7500 | — | — |
| 8/0 | 0.7083 | — | — |
| 7/0 | 0.6666 | 0.6666 | — |
| 6/0 | 0.6250 | 0.6250 | — |
| 5/0 | 0.5883 | 0.5883 | — |
| 4/0 | 0.5416 | 0.5416 | — |
| 3/0 | 0.5000 | 0.5000 | — |
| 2/0 | 0.4452 | 0.4452 | — |
| 0 | 0.3964 | 0.3964 | — |
| 1 | 0.3532 | 0.3532 | 0.3025 |
| 2 | 0.3147 | 0.3147 | 0.2755 |
| 3 | 0.2804 | 0.2804 | 0.2565 |
| 4 | 0.2500 | 0.2500 | 0.2360 |
| 5 | 0.2225 | 0.2225 | 0.2170 |
| 6 | 0.1981 | 0.1981 | 0.2075 |
| 7 | 0.1764 | 0.1764 | 0.1845 |
| 8 | 0.1570 | 0.1570 | 0.1675 |
| 9 | 0.1398 | 0.1398 | 0.1530 |
| 10 | 0.1250 | 0.1250 | 0.1340 |
| 11 | 0.1113 | 0.1113 | 0.1165 |
| 12 | 0.0991 | 0.0991 | 0.1065 |
| 13 | 0.0882 | 0.0882 | 0.0965 |
| 14 | 0.0785 | 0.0785 | 0.0890 |
| 15 | 0.0699 | 0.0699 | 0.0730 |
| 16 | 0.0625 | 0.0625 | 0.0605 |
| 17 | 0.0556 | 0.0556 | 0.0540 |
| 18 | 0.0495 | 0.0495 | 0.0495 |
| 19 | 0.0440 | 0.0440 | 0.0415 |
| 20 | 0.0392 | 0.0392 | 0.0390 |
| 21 | 0.0349 | 0.0349 | 0.0340 |
| 22 | 0.03125 | 0.0312 | 0.0285 |
| 23 | 0.02782 | 0.0278 | 0.0260 |
| 24 | 0.02476 | 0.0247 | 0.0230 |
| 25 | 0.02204 | 0.0220 | 0.0195 |
| 26 | 0.01961 | 0.0196 | 0.0165 |
| 27 | 0.01745 | 0.0174 | 0.0155 |
| 28 | 0.015625 | 0.0156 | 0.0145 |
| 29 | 0.0139 | 0.0139 | 0.0110 |
| 30 | 0.0123 | 0.0123 | 0.0105 |
| 31 | 0.0110 | 0.0110 | 0.0100 |
| 32 | 0.0098 | 0.0098 | 0.0095 |
| 33 | 0.0087 | 0.0087 | — |
| 34 | 0.0077 | 0.0077 | — |
| 35 | 0.0067 | 0.0069 | — |
| 36 | 0.0061 | 0.0061 | — |
| 37 | 0.0064 | 0.0054 | — |
| 38 | 0.0048 | 0.0048 | — |
| 39 | 0.0043 | 0.0043 | — |
| 40 | 0.00386 | 0.0038 | — |
| 41 | 0.00343 | 0.0034 | — |
| 42 | 0.00306 | 0.0030 | — |
| 43 | 0.00272 | — | — |
| 44 | 0.00242 | — | — |
| 45 | 0.00215 | — | — |
| 46 | 0.00192 | — | — |
| 47 | 0.00170 | — | — |
| 48 | 0.00152 | — | — |
| 49 | 0.00135 | — | — |
| 50 | 0.00120 | — | — |
| 51 | 0.00107 | — | — |
| 52 | 0.00095 | — | — |
Source: Hardware Tables, Formulae and Recipes... 6th edition. London: The Ironmonger, 1924. Pages 3 and 122.
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Last revised: 9 November 2005.