The observation accuracy of high‐range geodetic‐type worden gravimeters

The operation of two high‐range geodetic‐type Worden gravimeters on a program to establish primary gravimeter stations around the world afforded an opportunity to obtain detailed information on the accuracy of this type of instrument. A comparison of the instruments is made as to: (1) gravity intervals over a range of five gals, and (2) the drift characteristics and loop closures. The relative accuracy of observation with these gravimeters is ±0.3 mgal; and, therefore, when calibrated on an absolute basis a similar accuracy of observed gravity should be possible.