Braak Base Line
Schumacher and Gauss were also in close contact with Johann Georg Repsold . Schumacher used a base measuring device of his friend Repsold to measure the base. Repsold also made important contributions to the determination of the Altona meridian and the meridian circle of the Göttingen Observatory (distance 7.5 toises or 14.618 meters) in the form of his excellent instruments and improvements to existing instruments.