32 



A MANUAL OF TOPOGRAPHIC METHODS. 



Time determination: Example of record. 



[Rapid, 



ith Dakota, November 20, 18S>0. Fauth transit. No. 534. Sidereal chronometer: Bond & Sous, No. 

 1 division of level — 0'.118. Hourly rate of chronometer— 0".133.] 



Mean of levels— — 2.02 , 



5 = 6. Inequality of pivots.. 



Mean of levels = 



X . 118 =— .027 — b. Inequality of pivots = .00. 



