Written by Rabbi Dr. Levi Cooper – In Vienna 1820, Rabbi David HaKohen Friesenhausen (ca. 1756-1828) published a work in Hebrew entitled Mosdot Tevel (Foundations of the Universe). Friesenhausen procured rabbinic letters of recommendation which he printed in Mosdot Tevel, including such a letter from the illustrious Rabbi Moshe Sofer (known as the “Ḥatam Sofer”, 1762-1839), who, together with other rabbinic personalities in Hungary and Moravia, was even a prepaid subscriber to the book.