Kimberley, Northern Cape
His other astronomical work included the preparation of star correction tables and determination of Stellar parallaxes, in collaboration with David Gill. In 1887 he undertook an analysis of the tidal records of Table Bay and Algoa Bay. He also was involved in the determination of the relative longitudes of Cape Town, Aden, Delagoa Bay, Quelimane and Zanzibar. He also participated in the measurement of a baseline near Kimberley, Northern Cape in 1891.