( 334 ) 
1 (hall then fuppofe tlie Earth’s Radius (in 
Miles) 3975’j from whence I compute the Circum- 
ference 24975'.66i5, 9603, 8855, ^c. And one Degree 
69.3768,3776,6774,5988,3, c , 
Mr. JVhtfion^tPag.i^i^ fays that the Northern mag- 
netick Pole wa^ then about 13^ Degrees from the North 
Pole of the Earth : The Sine of which in natural Num- 
bers is 233,4454 to the Radius 1000,0000. 
1. As the Earth’s Radius (in Miles) 3975, to the 
.above-mentioned Sine of 13 Deg. 30 Min.233,4454, 
So the faid Magnet’s Radius 575 Miles to the Tabular 
Number 3 3.7688,3544^6540,8805,0311, 
2. As the Tabular Radius 1000,0000, to the faid 
Tabular Number, fo (in Miles) is the Earth’s Radius 
to the Radius of the Parallel of 13^ Gr. on the faid 
Magnet’s Surface : Or, fo is the Earth’s whole Cir- 
cumference to the Circumference of the Central Mag- 
net’s faid Parallel: Or, fo is one Degree of the 
Earth’s great Circle in Miles to one Degree of the 
faid Parallel of 13? Gr. on the faid Magnet’s Sur- 
face 2.34»7i7474>o*404iOi8>43, ^ C. 
The faid Degree reduced into F eet, and into Inches, 
is. 
In Feet and Parts 12369,8506,3163,6271,0156,59, 
In Inches and Parts 14843 8.io75,7963,525», 1879*145 
Which 2.34i7j6f’^7-. Miles the North magnetick Pole 
of the central Loadflone moves in fomewhat lefs Time 
than 4 folar Minutes, viz, in about 4 Minutes by 
the diurnal apparent Motion of the fixed Stars) But for 
as much as the Ratio of the internal Magnet’s Diame- 
ter to that of the Earth, is not probably calculated to 
Perfedion, I (hall proceed as if the faid Pole of the 
Magnet moved the faid Space perfectly in the Time of 
four Stellar Minutes. For 
