1834.] 



Latitude of Nasirdbdd. 



243 



VIII. — Latitude of the Church Bungalow at Nasirdbdd, by altitudes 

 (170) of Polaris out of the Meridian, observed with a Troughtons 

 lS-inch Altitude and Azimuth circle, by Col. Thos. Oliver. 



[We use the privilege allowed as by the author to omit the details of observations, 

 and confine our publication to the following abstract carefully calculated by the 

 author himself from them. We trust that the Church Bungalow will soon become 

 a more permanent structure ; it is a constant complaint of astronomers in this 

 country that points of reference are not to be had. — Ed.] 



Date. 



Horizontal 



Mean of 5 observa- 



Mean in each posi- 







point. 



tions on each face. 



tion of Microscopes. 











/ " 



* II 



December 



25th, 1831. 







26. 18. 03.0 



1 





28th, 







01.7 





January 



2nd, 1832. 







03.8 



> 26°. 18' 03''.2 





3rd, 







03.2 



| 





4th, 







04.5 



J 





5th, 



20 



08.4 







6th, 



20 



07.5 



0.90 





24th, 



20 



09.9 





25th, 



20 



10.2 







26th, 



340 



03.0 







29th, 



340 



17.58.8 



01.3 





31st, 



340 



18. 01.4 



February 



1st, 



340 



02.1 



__ 





21st, 



330 



17. 59.9 







26th, 



330 



18. 01.7 



01.5 





2/th, 



330 



01.6 





28th, 



1 330 



02.6 



„ 



Mean of the whole, 26. 18. 03.8 



The observations were conducted thus : five sights were taken with 

 the face of the circle east or west as it happened, the level (both 

 ends) being read off and noted after each sight. The instrument was 

 then turned round 180° in azimuth, and five mo re sights taken as before. 

 The correction for level (that is, the mean of the ten readings) has 

 been applied to the numbers in the column headed " Microscopes." 

 I have used Dr. Young's refractions, and the position of the star, as 

 given in the Greenwich Ephemeris. 



The Microscopes of the Altitude circle having a motion of about 60° 

 concentric with the circle, I occasionally availed myself of this contriv- 

 ance in order to get readings on different parts of the circle, and to 

 get rid of errors of division ; but I regret that I did not make more use 

 of this expedient, since so wide a result appears when the Microscopes 

 were placed at 20° from what the other positions give. The instru- 

 ment is now at the Lucknow Observatory, where I did hope that, in 

 the hands of my lamented friend Herbert, it would have had fair play ; 

 but he, poor fellow, died very soon after he received it. 



