AT THE OBSERVATORY AT PARAMATTA. 



1^1 



Length of the Pendulum at Paramatta. 

 The length of the pendulum vibrating seconds of mean solar time at Para- 

 matta in vacuo on the level of the sea at 0° Reaumur, is 992.4128 millimetres. 

 My observations for the determination thereof have been published in the 

 second part of the third volume of the Memoirs of the Astronomical Society 

 of London. I took the measure from a brass meter made by Lenoir at Paris, 

 which after my return to London was compared, by Messrs. Troughton and 

 SiMMS, with Sir George Shuckburgh's Scale of the same metal, and found 

 = 39.387988 English inches. Hence follows the length of the pendulum 

 vibrating seconds at Paramatta as above 39.0891435 English inches. 



Additions and Corrections. 

 Page 17. — ^Tlie immersion of 82 Geminorum, March 21, 1823, at 9^ 52'" 11».6, 



is mean time, and not sidereal time. 

 Page 29. — ^I'he longitude of Government House at Sydney, deduced from the 



Solar eclipses observed by 



Admiral Bligh, is lO"* 5™ lO'.S") 



Captain King 10 5 8 .2 J 



East of Greenwich. 



Page 26. — Additional Obsei-vations of Moon-culminating Stars. 



