The earliest surviving Phonovision disc depicts one of the dummy heads that Baird employed for tests.
ðɪ ˈɜːlɪɪst sɚvˈaɪvɪŋ fˈɑːnəvˌɪʒən dˈɪsk dᵻpˈɪkts wˈʌn ʌvðə dˈʌmi hˈɛdz ðæt bˈɛɹd ɛmplˈɔɪd fɔːɹ tˈɛsts.