> Original Poster: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> Snip... > I found the formula worked to a couple of percent on that series of > coils I progressively wound over the same length with fewer and > fewer turns last year. I was absolutely amazed! I ended up with a 3 > foot length of coil with just half a dozen turns of 0.8mm wire on it. At > Snip... Hi Malcolm, Do you mean half a dozen in total or per inch here? Ruud de Graaf