Vectorized version of <a href="//commons.wikimedia.org/wiki/File:Altimeter.gif" class="mw-redirect" title="File:Altimeter.gif">Image:Altimeter.gif</a>
<a href="//commons.wikimedia.org/wiki/User:Badseed" title="User:Badseed">Badseed</a>
2008-02-10
Own work based on image from <a rel="nofollow" class="external free" href="http://asrs.arc.nasa.gov/callback_issues/233_2.gif">http://asrs.arc.nasa.gov/callback_issues/233_2.gif</a>