284 



HYDROGRAPHICAL SURVEYING [chap. xii. 



Mn. Time of Transit 

 Long, in time .. 



G. M. T. .. 



R. A.M. an© .. 

 Corr. for 8h. 

 „ „ 18m. .. 



R. A. =!c .. 



M. T. Transit .. 

 Watch fast 



Time by watcli at 

 Transit .. 



Mean obs. alt. 



I. E 



App. alt. . 

 Refraction 



Tr. alt. . 



Cos. dec. 

 Cos. lat. 

 Sec nh. 

 12-71 



9-989329 



9-878027 



•323S71 



1-105510 



Reduction 



Tr. alt. 

 Red . 



Z. D. .. 

 Doc. .. 



Latitutlc 



meant as a standard wliich we must expect always to get. 

 Here no value is given, as each pair were nearly equally good, 

 and the observations were nearly the same as to number. 



It is, however, evident, on an inspection of this set of 

 observations, that the sextant had a centring error. It will 



