ON THE DETERMINATION OF TRANSATLANTIC LoNGlTUDB 



H 



B 2 



B 3 

 B 4 



Qi 



c 3 

 c 4 

 a 



Pi 



D 2 

 D 3 



Ex 



E 2 



E 3 



E 4 

 E 



F 2 

 F 3 

 F 4 



F. 



Adopted Values of the Equator oil Thread luUrrah 



C. S. Transit Instrument, 



No. 4. 



+34.174 

 +31.817 

 +29.269 

 +26.860 

 +24.308 



+19.433 

 +17.173 



t 14.533 

 12.019 

 9.826 



5.035 

 2.484 

 0.043 

 2.364 



4.755 



9.691 

 12.205 

 14.630 

 17.153 

 19.470 



24.451 



26.818 

 29.399 

 31.799 

 34.153 



From 31 Observations. 





B, 



B, 



B, 

 B 4 

 B 5 



C, 



c 2 

 c 3 

 c 4 

 c. 



Dx 



D 9 



Ex 

 E 2 



E 3 

 E 4 

 E, 



F 2 

 F 3 



F 4 

 F< 



C 8. Transit Instrument. 



No. S. 



From 24 Obserrallgas. 



+.36.450 

 +33.924 

 +31.320 

 28.800 

 2G.20 



+20.«'.-,0 

 +18.307 



15.4 1 



13.051 

 10.498 



5.L»:;2 

 2.551 

 0.08 

 2.H30 

 5.27 1 



10.413 

 12.972 

 15.565 



18.201 



20.787 



26.102 

 28.671 



34.057 

 3C.703 



The equatorial thread 



used in the 



putations were 



obt 



for <1 



C S. transit-instruments No. 4 and No. 6 from the observations made by Mr. Dean and 

 Mr. Goodfellow in the course of the campaign 

 C. S. transit-instrument No. 5 are the 



Th 



ijuatori 



read-i nervals for 



those found by Mr. I mc Bradford, 

 from the observations made at Cambridge, in 1869, by Mr. A. F. Mosman and Mr I 

 Blake, Jr. No observations were made for this purpose in the campaign of 186 J- JO. 

 The computations to find the clock and instrumental correction,, for a mgh mgl.t, 



given in detail 



illustration of the method adopted. 



