RG 41 and RG 62

The first gravity measurement in Sweden was made in 1741 in Uppsala by Anders Celsius. The first fundamental gravity network in Sweden was measured two hundred years later.

Anders Celsius determined the difference in gravity between London and Uppsala using a pendulum clock specially designed in London for his use.

The RG 41 gravity system

Between 1941 and 1948, a complete first-order gravity network was measured in Sweden. The network, which was used to define RG 41, contained 33 stations and was connected to a center of gravity in the German city of Potsdam, by the Baltic Geodetic Commission.

The RG 62 gravity system

Between 1960 and 1966, a new first-order network was measured, which then became the second basic gravity network in Sweden. The corresponding gravity system was named RG 62. The network contained 98 stations and the system is connected to Potsdam via the European Calibration System 1962 (ECS 62). The same value for Potsdam was used as in RG 41.

In the late 1970's, it was found that RG 62 did not meet the modern requirements that can be placed on a basic gravity system. The uncertainty was too high, the points in the first-order network were not marked and more than 30 percent of the points were destroyed. Additionally, it was discovered that the whole network was about 14.5 mGal too high (a very large error) because of a gross error in som old measurements in Potsdam. Therefore, the work was started to establish a new gravity network in Sweden, which ultimately resulted in the gravity system RG 82.

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