Great Vowel Shift Chart
<a href="//commons.wikimedia.org/wiki/User:Goran_tek-en" title="User:Goran tek-en">Goran tek-en</a>
CC BY-SA 4.0
<p>Own work based on:<br><span style="color:#69F">✦ </span><a href="//commons.wikimedia.org/wiki/File:Blank_vowel_trapezoid.svg" title="File:Blank vowel trapezoid.svg">Blank vowel trapezoid.svg</a> <i>by</i> <a href="//commons.wikimedia.org/wiki/User:Moxfyre" title="User:Moxfyre">Moxfyre</a>
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Information from:
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<ul><li><a rel="nofollow" class="external text" href="http://www.ling.upenn.edu/courses/Fall_2007/ling001/gvs.gif">ling.upenn.edu</a></li>
<li>Requested by and knowledge from <a href="//commons.wikimedia.org/wiki/User:Maunus" title="User:Maunus">Maunus</a></li></ul>