Woodward, D.J. 1979 Gravity meter readings at the New Zealand primary gravity network stations in Central Otago. [s.l.]: [s.n.]. Report / Geophysics Division 139 17 p.
Abstract: Repeated gravity readings at the New Zealand Primary Gravity Network stations in Central Otago indicated that there appeared to be a change of the gravity different between Omakau and Idaburn of about 15 microN/kg over a 20-year period. Levelling by the Ministry of Works and Development has however shown no significant level changes in the same region, so it appears probably that the apparent change in gravity is due to an error in the gravity readings made in 1955 with the North American gravity meter