Prof. Theodor Siebs, identified in the text as "Geheimrat Dr. Siebs, Professor of Phonetics, University of Breslau", voices the German vowels, diphthongs and consonants.
Collection Technical Notes:
Phonograph record is the 10-inch, 78 rpm, monophonic lacquer Linguaphone disc, cat nos. GS.1.EA and GS.2.E. A text was found in the record sleeve. WAV file is now converted to an MP3.