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2. American wire gauge - Wikipedia

   en.wikipedia.org/wiki/American_wire_gauge

   Any two successive gauges (e.g., A and B) have diameters whose ratio (dia. B ÷ dia. A) is (approximately 1.12293), while for gauges two steps apart (e.g., A, B, and C), the ratio of the C to A is about 1.12293 2 ≈ 1.26098. Similarly for gauges n steps apart the ratio of the first to last gauges is about 1.12293 n.

3. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   Size steps between gauges range from 0.001 inches (0.025 mm) between high gauge numbers to 0.046 inches (1.2 mm) between the two lowest gauge numbers and do not correspond to a particular mathematical pattern, although for the most part the steps get smaller with increasing gauge number. [3]

4. Wire gauge - Wikipedia

   en.wikipedia.org/wiki/Wire_gauge

   Wire gauges may be broadly divided into two groups, the empirical and the geometric. The first includes all the older gauge measurements, notably the Birmingham gauge (B.W.G. or Stubs) and the Lancashire. The origin of the B.W.G. is obscure. The numbers of wire were in common use earlier than 1735 when the measurements were officially defined. [1]

5. List of track gauges - Wikipedia

   en.wikipedia.org/wiki/List_of_track_gauges

   See 8 + 1 ⁄ 4 in (210 mm) gauge ridable miniature railways: 229 mm 9 in: See 9 in (229 mm) gauge ridable miniature railways: England: Railway built by minimum gauge pioneer Sir Arthur Heywood, later abandoned in favor of 15 in (381 mm) gauge. 240 mm 9 + 7 ⁄ 16 in: See 9 + 7 ⁄ 16 in (240 mm) gauge ridable miniature railways: 241 mm 9 + 1 ...

6. Body jewelry sizes - Wikipedia

   en.wikipedia.org/wiki/Body_jewelry_sizes

   Generally, the system of gauge-and-inches is used: In gauge notation, jewelry less than 1 ⁄ 2 ″ thick is typically measured in a system originally devised for measuring wire thickness. A gauge number denotes a thickness on a standardized scale which, for most purposes, starts at 20g (0.812 mm thick— often used for the posts for nose studs ...

7. Standard wire gauge - Wikipedia

   en.wikipedia.org/wiki/Standard_wire_gauge

   No. 1 is 0.30 in. (300 thou), and the smallest, No. 50, is 0.001 in. (1 thou or 25.4 µm). The system as a whole approximates an exponential curve , plotting diameter against gauge-number (each size is a approximately a constant multiple of the previous size).