160 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Denver, May 11. 



In determining latitude with an instrument of small size, Talcott's 

 method is subject to some inconveniences, which may sometimes be 

 better avoided by using Bessel's method ; that is, by establishing the 

 transit in the prime vertical. 



But here the same principle (immediate elimination of azimuth 

 error) ought to be carried out; that is, the same stars should not, in 

 general, be used east and west of the meridian. Tliis process is Bes- 

 sel's own, as distinguished from Struve's. 



I annex a scheme of observation (from the Report for 1873-74 



Star's name. 



p Herculis . 

 6 Lacertae . 



Andromedae 



6 Herculis . 

 ^ Anilroinedae 



1 Andromedae 

 C Lyrje . . 

 7j Lyrae . . 

 ju Andromedae 

 9 Lyraj .' . 



7 Cygni . . 

 T Andromedae 



V Andromedte 



V Cygni . . 

 75 C^ygni . 

 y Andromedae 

 16 Persei 



<r Cygni 



Time of 

 transit. 



h. m. 



20 17 

 22 

 43 

 50 



21 19 

 SO 

 36 

 52 

 56 



4 

 51 

 1 

 6 

 17 

 35 

 44 

 50 

 56 



22 



23 



A. R. 



h. m. 9. 



17 19 19 

 22 25 3 



22 56 7 



17 51 54 

 10 30 



23 31 57 



18 40 25 



19 9 27 



49 45 



19 11 59 



20 17 42 



1 33 9 

 1 29 24 



20 52 28 



21 35 14 



1 56 10 



2 42 38 

 21 12 47 



Decl. 



37° 16' 

 42 29 



41 39 

 37 16 

 37 59 



42 34 



37 2'j 



38 56 

 37 49 

 37 55 



39 51 



39 56 



40 46 



40 41 

 42 42 



41 43 



37 48 



38 52 



