millimeter wire gauge

After 1872, in Germany, Austria, and subsequently elsewhere. Notice the curious fractional notation.

Gauge
number
Diameter,
millimeters
100 10.0
94 9.4
88 8.8
82 8.2
76 7.6
70 7.0
65 6.5
60 6.0
55 5.5
50 5.0
46 4.6
42 4.2
38 3.8
34 3.4
31 3.1
28 2.8
25 2.5
22 2.2
20 2.0
18 1.8
16 1.6
14 1.4
13 1.3
12 1.2
11 1.1
10 1.0
9 0.9
8 0.8
7 0.7
6 0.6
5/5 0.55
5 0.5
4/5 0.45
4 0.4
3/7 0.37
3/4 0.34
3/1 0.3
2/8 0.28
2/6 0.26
2/4 0.24
2/2 0.22
2 0.2

A letter from Felten & Guilleaume, of Müllheim, near Cologne, "the largest makers in the world of iron and steel telegraph wire" replying to an inquiry from a M. Welles, who submitted it to The Electrical World. It subsequently appeared in The Electrician and Electrical Engineer, vol. 5, page 476 (Dec. 1885). Welles commented that “the statements made as to usage in different countries refer to line wire, and not to sheet metal, fine copper wires, etc.”

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