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Previous Thread Next Thread Print Thread pinnate #123361 02/19/2004 2:18 PM Joined: Jan 2001 Posts: 13,858 wwh Carpal Tunnel wwh Carpal Tunnel Joined: Jan 2001 Posts: 13,858 I often see jet vapor trails as I sit eating grapes and enjoying warmth of morning sun. At first the trail is very narrow, but well behind the invisible plane, it sometimes becomes two parallel columns, and then one side only because broadened with tiny parallel barbs perpendicular to the one that stays a column, each gradually widening further and fading, but looking like a mile long pinnate plume. I cannot imagine what the mechanism is that changes only one of the columns. Bean, where are you? Copy Link to Clipboard Share Post on Facebook Share Post on Twitter Re: pinnate #123362 02/19/2004 4:55 PM Joined: Jan 2001 Posts: 13,858 wwh Carpal Tunnel wwh Carpal Tunnel Joined: Jan 2001 Posts: 13,858 Here is a URL to a very large number of pictures of contrails. Some of them are of old prop driven planes at lower altitudes.I couldn't find any that showed clearly what I see here in Los Angeles area. http://www.astro.ku.dk/~holger/IDA/S/choise.html Apparently the conditions of air temp and humidity, and difference in altitude make a lot of difference. Copy Link to Clipboard Share Post on Facebook Share Post on Twitter Moderated by  Jackie  Hop To General Topics ------  Information and announcements  Q&A about words  Wordplay and fun  Words and languages in schools  Miscellany  Weekly Themes  Looking for (writers, speakers,... (Old) Weekly themes. (have been... ------  Words from medicine  Beheading words  Meta-words  Words from classical mythology  Animal Safari  Words with unusual etymologies  Eponyms or words derived from p...  Loanwords from German  English as a global language Print Thread Switch to Threaded Mode Show Likes Link Copied to Clipboard View Profile Private Message Follow User Forum Posts Like Summary View Profile Private Message Follow User Forum Posts Like Summary

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