text_original: In other terms they cause the plane of polarisation to rotate to the left to an extent proportionate to their thick  ness.
text_transcription: IN OTHER TERMS THEY CAUSE THE PLANE OF POLARIZATION TO ROTATE TO THE LEFT TO AN EXTENT PROPORTIONATE TO THEIR THICKNESS
phonemes: ɪn ˈʌðɚ tˈɜːmz ðeɪ kˈɔːz ðə plˈeɪn ʌv pˌoʊlɚɹəzˈeɪʃən tə ɹoʊtˈeɪt tə ðə lˈɛft tʊ ɐn ɛkstˈɛnt pɹəpˈɔːɹʃənət tə ðɛɹ θˈɪk nˈɛs.