, Be, | 
In 1745 Mr. Roger Kendrick writes it 18 degrees wett. 
In 1751 Mr. Gibfon publifhed it 19 degrees weft. 
In 1772 I found it, by feveral careful obfervations, 23 degrees 
30 minutes weft. 
In 1786, May 26th, I alfo found it 26 degrees 21 minutes weft. 
And, 
In 1790, September 27, - - 27 degrees 15 minutes weft. 
THESE were all publifhed at the times they were obferved. 
Tue data here given I prefume are fufficient to prove the 
uniformity at Dublin. 
Ir fhould be noticed that Mr. Gibfon publifhed his account 
of the variation in 1751, and the year following, viz. in 1752, 
he affixed the fame variation to a map now in the poffeffion of 
William Deane, Efg. which isa proof that he was unacquainted 
with the annual change. 
Berore I begin the general operation, I cannot avoid remark- 
ing, witha degree of aftonifhment, that there is mot one obferva- 
tion on the variation of the needle to be found in any of our city records 
from the year 1657 to the year 1745, at which time Roger Kendrick, 
then City Surveyor, mentions that it was 18 degrees wefterly, as 
appears by a map of part of the lamds of Baldoyle in the Town 
Clerk’s office at the Tholfel. This circumftance refle&s no 
credit on the Land Surveyors of Ireland. They muft have had 
little curiofity during that time, or have been totally excluded from 
any intercourfe with learned focieties abroad, every one of which 
has 
