Original poster: "K. C. Herrick by way of Terry Fritz <terry-at-hot-streamer-dot-com> by way of Terry Fritz <twftesla-at-qwest-dot-net>" <kchdlh-at-juno-dot-com> Here's a handy chart I found in an old reference book. [Terry- Perhaps you'd copy this msg to pupman-dot-com?] http://hot-streamer-dot-com/temp/skindepth.gif Ken Herrick