http://www.smecc.org/heliograph_-_signaling_by_the_sun.htm -- Thanks Ed Sharpe archivist for SMECC Please check our web site at http://www.smecc.org to see other engineering fields, communications and computation stuff we buy, and by all means when in Arizona drop in and see us. address: coury house / smecc 5802 w palmaire ave glendale az 85301 * To join/leave the list, search archives, change list settings, * * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *