---------- Forwarded message ---------- Date: Tue, 5 May 1998 19:35:33 +-100 From: Robert Davis <RE.Davis-at-btinternet-dot-com> To: 'Tesla List' <tesla-at-pupman-dot-com> Subject: Pancake Coil Formula Hi All, Does anyone have the formula for calculating inductance of a flat spiral coil please? Thank you in advance, Best wishes, Rob Davis (UK)