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Dictionary


dou'ble cen'tering



Survey.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

double-breastingdouble check

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