Among his work was measurements of velocities of the Magellanic Clouds, the first such study of extra-galactic velocities.
ɐmˌʌŋ hɪz wˈɜːk wʌz mˈɛʒɚmənts ʌv vəlˈɑːsᵻɾiz ʌvðə mɐdʒɪlˈænɪk klˈaʊdz, ðə fˈɜːst sˈʌtʃ stˈʌdi ʌv ˈɛkstɹəɡɐlˈæktɪk vəlˈɑːsᵻɾiz.