LONGITUDE OP WESTERN BOUNDARY LINE. 



147 



DATE. 



Axis. 



star. 



No. of wires. 



Clocli. 





E 



E 



u Bootis 

 a Bootis 



10 

 11 



H. M. S. 



3 30 54.07 

 3 32 58.38 



Aiio'imt 80 





Whence, together with the level correction of + 0^.04, result the cor- 

 rections of the clock for the instants of observation respectively : 



to sidereal time + lO^ 32'° 37^68, or to mean time, + 23^42, 

 and + lO"! 36"! 33^35, or to mean time, + 23^17 ; 



which have been used in reducing the telegraphic comparisons. The 

 rate of the clock and the errors of the instrument were checked again 

 by a complete set of transits after my return, on September 6. 



The altitudes of the sun at State Line Station were taken in sets of 

 twenty, — either symmetrically distributed or of equal number in regard 

 to the limbs, — which have been reduced singly, in order to investigate 

 the probable error of each set. For the sake of brevity, I give here only 

 the sets of the first day in full as a specimen, being those upon which the 

 longitude mainly reposes ; of the others it may suffice to report the result- 

 ing corrections of the chronometer, which, it will be remembered, is 

 rated for sidereal time. There was still one set made on the morning 

 of August 31, but this afterwards has been found not available, on 

 account of some mistake in the shading sim-glasses of the sextant. 



ALTITUDE OF O AT STATE LINE STATION. 



1865. August 30, 5 morning. 



Sidereal 



Double 





Corrected alti- 



Hour-angle 



Sidereal 









altitude by 





tude of 









AC 



chronometer. 



sextant. 





sun's centre. 



computed. 



time. 





h. 



m. 



sec. 



deg. 



m. 



sec. 



deg. 



m. 



sec. 



deg. 



min. 



h. 



m. 



sec. 



m. 



sec. 



6 



40 



41.5 



52 



9 



35 



U 



25 



44 



24 



-63 



9.16 



6 



22 



44.7 



-17 



56.8 



6 



42 



28.0 



52 



47 



45 



u 



26 



3 



32 



62 



52.71 



6 



24 



30.8 



17 



57.2 



6 



44 



29.5 



53 



34 



50 



u 



26 



27 



8 



62 



10.05 



6 



26 



41.7 



17 



47.8 



6 



46 



20.0 



54 



11 



55 



u 



26 



45 



40 



61 



44.42 



6 



28 



24.5 



17 



55.5 



6 



47 



39.0 



53 



36 



35 



L 



26 



49 



45 



61 



24.88 



6 



29 



42.9 



17 



56.1 



6 



48 



51.0 



54 



2 







L 



27 



12 



29 



61 



7.22 



6 



30 



53.7 



17 



57.3 



6 



51 



4.5 



54 



48 



45 



L 



27 



35 



53 



60 



34-69 



6 



33 



4.2 



17 



60.3 



6 



53 



11.0 



55 



34 



40 



L 



27 



58 



53 



60 



2.73 



6 



35 



12.4 



17 



58.6 



6 



55 



55.5 



57 



37 



30 



U 



28 



28 



35 



59 



21.19 



6 



37 



59.0 



17 



56.5 



6 



56 



41.0 



57 



50 



37 



u 



28 



35 



10 



59 



12.05 



.6 



38 



35.7 



17 



64.3 



6 



58 



17.5 



58 



27 



35 



u 



28 



53 



40 



58 



46.19 



6 



40 



19.3 



17 



58.2 



7 







12.0 



59 



7 



30 



u 



29 



13 



38 



58 



18.14 



6 



42 



11.9 



17 



60.1 



7 



4 



5.5 



59 



29 



45 



L 



29 



26 



33 



57 



17.89 



6 



46 



13.5 



17 



52.0 



7 



5 



15.0 



59 



51 



55 



L 



30 



7 



44 



57 



2.15 



6 



47 



16.7 



17 



58.3 



7 



6 



12.0 



60 



12 







L 



30 



17 



43 



56 



48.21 



6 



48 



12.8 



17 



59.2 



7 



7 



52.5 



60 



47 



7 



L 



30 



35 



17 



56 



23.26 



6 



49 



52.7 



17 



59.8 



7 



9 



18.5 



62 



21 



40 



U 



30 



50 



51 



56 



1.22 



6 



51 



21.1 



17 



57.4 



7 



10 



25.0 



62 



45 







U 



31 



2 



32 



55 



44.72 



6 



52 



27.2 



17 157.8 1 



7 



11 



18.0 



63 



4 



35 



u 



31 



12 



19 



55 



30.84 



6 



53 



22.9 



17 



55.1 



7 



12 



30.0 



63 



30 







u 



31 



25 



3 



55 



12.78 



6 



54 



35.4 



17 



54.6 



