Adams. — The Hector Observatory. 



591 



Bolton Street Observatory 

 less Bay 



Doubtless Bay - Norfolk Island 

 Norfolk Island - Southport 



Southport - Sydney 



Doubt- ) 



5. In 1903-4 Dr. Otto J. Klotz* determined a number of transpacific 

 longitudes, and included in his work Sydney, Southport, Norfolk Island, 

 Doubtless Bay, and Bolton Street Observatory. The resulting differences 

 of longitude and observers were, — 



Differences of Longitude. Observers. 



5" 08-941+ 0-045 |^ + om ^f ing ' 



( Otto Klotz. 



Otto Klotz, 



F. W. 0. Werry. 



F. W. O. Weny, 



Otto Klotz. 



(Otto Klotz, 

 08 50-495 ± 0-016 H. A. Lenehan, 



IW. E. Raymond. 



22 15-000 + 0-021 



58 01-364 ±0-008 



6. These observations give the complete circuit between Wellington 

 and Sydney direct, and between Wellington and Sydney via Doubtless 

 Bay, Norfolk Island, and Southport, thus 



Sydney-Wellington (Mount Cook) 

 Mount Cook - Bolton Street 

 Bolton Street - Doubtless Bay 

 Doubtless Bay - Norfolk Island 

 Norfolk Island - Southport . . 

 Southport - Sydney 



Giving an error in the circuit of 0-016s. 



7. The error 0-016s. is distributed over the differences of longitude, 

 giving the following values : — 



Sydney-Wellington (Mount Cook) 

 Mount Cook - Bolton Street . . 

 Bolton Street - Doubtless Bay 

 Doubtless Bay - Norfolk Island 

 Norfolk Island -Southport . . 

 Southport - Sydney 



8. To determine the longitude of Wellington (Mount Cook), the difference 

 Sydney- Wellington is applied to the longitude of Sydney. 



The longitude of Sydney is given (a) as lOh. 4m. 49-54s. in the " British 

 Nautical Almanac," 1914; (b) as lOh. 4m. 49-355s. using Klotz, p. 194; 

 and (c) as lOh. 4m. 49-366s. using Klotz, p. 194, Albrecht's adjusted value 

 for Potsdam. | 



9. Hence the following values for Wellington, Mount Cook Observatory : — 



H. m. s. 

 From 8(a) . . . . . . . . 11 39 6-526 



From 8 (b) . . .. .. .. 11 39 6-341 



From 8(c) .. .. .. .. 11 39 6-352 



* Otto J. Klotz : Report of the Chief Astronomer for the year ending 30th June, 

 1905; Appendix 3; Ottawa, 1906. Otto J. Klotz: Trans. N.Z. Inst., 1906, vol. 39, 

 Article 2, p. 49 ; Wellington. 



t Th. Albrecht : " Astronomische Nachrichten," No. 3993. 



