( 208 ) 
And confequently, by an Operation that Will be 
juft the Reverfe of this, if upon a Plane we deli- 
neate fuch a Parallelogram as this, we bay then lay 
down all the Places that are contain’d in it very ex- 
actly, in their proper Situation of Longitude and 
Latitude ; and then apply its middle Line, or Equa- 
tor, to that of a Globe of a due Magnitude, which 
will then become a Portion of a cylindrical Surface, 
circumscribed about the Globe. Then by prefling it 
dole to the Body of the Globe, we lhall caufe it to 
contract itfelf a very little, but regularly, which 
Contraction will be only according to Longitude, 
and not at all according to Latitude ; and then the 
cylindrical Surface will be changed into that of a 
Sphere, and will become the firft fpherical Zone 
before delcribed, with all it's Delineations in their 
due Pofition, without fenfible Error. 
In like manner in thefecond fpherical Portion, or 
Zone, comprehended between the Parallels of five 
and fifteen Degrees, Whofe middle Line is the Pa- 
rallel of ten Degrees, we may conceive the Seg- 
ments of the Meridians to unbend gradually on each 
Side, and to extend themfelves into Tangent right 
Lines, which therefore will form a Segment of a 
conical Surface, ftill touching the Globe in the Pa- 
rallel of ten Degrees of Latitude. The Axis of this 
Cone will coincide with the prolonged Axis of the 
Globe, and the Side of the Cone, which is to be 
eftimated from the Vertex to the Circle of Con- 
tad:, will be the Co* tangent of the Latitude, or the 
Tangent of 8 o Degrees. Now this Portion of a 
Conical Surface may eafily be conceived to be un- 
roll’d, or to be expanded into a plane Surface, with- 
out 
