On Nov 30, 2010, at 8:42 AM, William H. Fite wrote: > I expect you can do the same thing with an electric fan. Or by chewing something crunchy (like ice) while watching a raster-scanned (CRT) television. -- Mark J. Blair, NF6X <nf6x at nf6x.net> Web page: http://www.nf6x.net/ GnuPG public key available from my web page.