<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.6000.16481" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face="Bookman Old Style">Thanks to those gazers who put up with my lame questions during my initiation into earnest gazing on 14-15 June. Everybody has firsts, and mine were marvelous: Grand (twice), Daisy, Castle, Riverside, and Lion, to name the high points. Among the many things my untrained eye had trouble evaluating was the height of any given eruption. For instance, I guestimated Grand's bursts at roughly 100 feet. I was informed that they were at least 150, perhaps 180 feet high. Question: Is there a recognized technique for measuring eruption height without relying on actual instrumentation? How do you guys do it -- or is it best not to try? Thanks. John Taliaferro </FONT></DIV></BODY></HTML>