Birmingham sheet and hoop gauge

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.

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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