[ 2 %° 3 
-AT- B. As the Variation of the Needle at London 
has not been regularly published from time to 
time in the Philofophical Tranfa&ions : It may 
not be improper to take notice here , that accord- 
ing to the beft Obfervations extant , and which 
were made by Terfons of great Skill and Exaft- 
aftnefs , the Needle at London declined to the 
Eaftward n° 15' in the Tear if 80. In 1657 
there was no Variation , the Needle then point - 
ing due North . In 1 672 the Variation was ob m 
ferved by the late Dr. Halley 2 0 30' towards 
the Weft, and in 1692 6° o / . And towards 
the Beginning of the Tear 1723, it was found by 
Mr. Graham, from the Medium of a vafl Num- 
ber of Obfervations , to be then 14 0 17' the fame 
Way. So that , during the Courfe of 167 Tears 
elap fed fine e the Tear 1580, to the End of the 
laft Tear 1747* the magnetic Needle at London 
has moved to the Weftward, 28° 55'. See be- 
fore N°. 148, and N 9 , 383 of th c Thilofophical 
Tranfaftions. . 
