<P> SWG was fixed by Order of Council August 23 , 1883 . It was constructed by improving the Birmingham Wire Gauge . It was made a legal standard on March 1 , 1884 by the British Board of Trade . SWG is not to be confused with American Wire Gauge which has a similar but not quite interchangeable numbering scheme . </P>
difference between american wire gauge and standard wire gauge
similar but not quite interchangeable numbering scheme