double centering
noun Surveying.
a method of extending a survey line by taking the average of two foresights, one with the telescope direct and one with it inverted, made each time by transiting the telescope after a backsight.
Words nearby double centering
double blossom,
double bogey,
double boiler,
double bond,
double bridle,
double centering,
double check,
double chin,
double cloth,
double coat,
double coconut