I googled" the great vowel shift", now i know, but i don't deserve the price.
Nice try! The chart represents a specific aspect and period. That's the question.
And I thought you wanted to allude to "speechless by sore throat" :-)
Thanks Brigitta. I'm speechless in the face of the continued candidacy of Trump. But this is a representation of the way Old English vowels were pronounced. (I didn't really expect anyone to care.) Maybe the pronunciation is somewhat familiar to you as a German speaker.
I read Beowulf (in old English!), and liked it very, very much.