The Heliometer of the Kuffner Observatory in Vienna was delivered in 1893 and put into operation in 1896. It is built by Repsold & Söhne (Hamburg), optics by Steinheil & Söhne (Munich). This Heliometer is the largest in the world. 16 Stellar parallaxes were measured between 1899 and 1908, it was about an eighth of the world's measured parallaxes.