His widow, Maria, was granted the privilege of carrying on the work as a means of livelihood and continued the business until her retirement in 1892, when she was in her eighties.
Его вдова, Мария Элизабет, продолжила дело супруга, снабжая клиентов точным временем до 1892 года, когда в возрасте около восьмидесяти лет она передала дело дочери.