~ ( 268 ) 
The Angle EGe in Fig.i^ which is the Declination gc 
of EG from the Meridian weft ward 0.26. o. 
The Angled 9, which is the Declination of G I 
from the Meridian Eaft ward i . 9^ 
The Angle IN\^, which is the Declination of IN 
from the Meridian Eaft ward 2. 9. 10. 
The Angle VN/3 in Fig, 2. which is the-Declinati- 
on of NV from the Meridian Weft ward 1 8. 55. c. 
So that in all thefe 4 Triangles, EGe, GI0, INV, VN/5, you have .i 
two Angles kno\vn (for the Angles at «, at 9,at V, at /3, are right,Jand 
a fide, viz,. EG. Gf. IN. N V. whenc he concludes^ Toifes. Feet, 
The length of the Meridian Gs to be 31S94. o. 
of the Meridian I d 17560. 3. 
of the Meridian NV 18893. 3. 
of the Meridian N/3 10559. 3. 
And hence the length of the whole Meridian « between the Paral- 
lels of Malv oy fin dXid Amiens to be 78907. 3, 
Here he cafts in an Objefiion, and faith, that thefe Lines, which 
make up the Meridian, are not, in a ftrift fenfe, a Curve, but in rea- 
lity the fide of a Polygone circnmfcri bed about the Circumference 
. of the Earth. Eut,for anfwer to this, he affirms the Difference be- 
tween thofe Lines and a true Curve to be but 3 foot per degree, 
which hefaithisfcarceworth taking notice of. This he proveth 
afterwards^ where he makes the Table, in which he calculates,what 
difference there is between the real Level and the apparent. 
To this he fubjoyns a Note, importing, that though be took 
thefe Meridians, for greater exaflnefs, with a Quadrant ; yet he 0- 
mittednot to ufea Compafs, wbofe Declination to the Wejlrvard^ 
he faith, in the Year 1670 , towards the end of the Summer, 
he found i**. 30'. 
Whereas 1 666.he obferved very little variation , 
if any at all. 
But A, 1664. varied Eajl-rvard 0» 4a. 
Here he makes a pretty Note, telling us, that the 
Differenceof Variation in a years time amounts to o. 20'. 
The Length ofthe Meridian between iVfJ^;^?;^;? and Amiens be- 
ing thus fl:ated,his next bufinefs is, in the ninth Article, to enquire, 
What anfwers to it in the Heavens, comparing rhofe Meridiandi- 
ilances, already meafur'd, with Minutes and :^econds there : which 
were 
