A little question to the experts: Coil wires

I'm a proud owner of a Moog Etherwave Standard, but I still have the idea in mind to develop my own theremin. So I'm studying schematics through the whole www in order to understand better what makes a really good theremin.

Now I discovered a geographical trap: In US and other anglosaxon circuits, they often tell to wind a coil with i.e. #22 wire or #30 wire. Here in western Europe they tell normally the wire diameter, i.e. 0.25 mm. Does anybody know if there exists a conversion factor which will allow to me to replace the #xx by a (metric) diameter?

Thank you in advance

Here is a website with a conversion chart.

Wire Sizes (http://www.powerstream.com/Wire_Size.htm)

The small non-metric wire you are interested in will be designated as a number (#XX) or as AWG (American Wire Gauge). They mean the same thing.

In the US, the coated copper wire is known as "magnet wire".

Jeff, thank you so much! This is exactly what I looked for.