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> The Birmingham wire gauge, used for iron, steel, and brass
> wires, starts with No. 0000 = 0.454 inch (1.153 centimeters)
> and goes down to No. 36 = 0.004 inch (0.010 centimeter)
> diameter.
Hi Kat,
Citing from Turning & Mechanical Manipulation, by Charles
Holtzapffel, London 1847: "It should be further observed that
the Birmingham and other gages seem to have been originated in
great measure accidentally, or almost by the eye alone, and
without any attempt at system, either regards the values of the
intervals between the successive measures or numbers, or their
correspondence with the subdivisions of the inch."
regards, Markus
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