It took a very experienced and conscientious observer to maintain the theoretical reading accuracy of 0.01 mGal. ... The G (geodetic) meter has a single long measuring screw that is used to give readings worldwide without resetting, whereas the D-meter, ... A battery charger is needed in the field, since a single charge lasts only one or two days, depending on thermostat setting and external temperature.
|Author||:||John Milsom, Asger Eriksen|
|Publisher||:||John Wiley & Sons - 2011-06-24|