( ro 6 ) 
but may be made much more accurate and particular, 
as being capable of being form'd to a much larger Di- 
ameter than a Globe can conveniently be made to. 
The Maps may firft be printed upon a Plane, as is 
ufual in the common Globes, and then palled upon 
thin convex Shells of Paftboard, form'd to the inten- 
ded Radius. The forming of thefe fpherical Coats 
of Paftboard will be a Matter of no great Difficulty, 
even to as large a Diameter as fhall be defired ; but 
the chief Art will be required in projecting the Maps 
in piano , after the fimpleft and exacted Manner, fo 
as that they may adapt themfelves, with as little 
Error as poffible, to a fpherical Surface. For a 
plane Surface cannot be converted into a fpherical 
Surface without fome Error. The beft Method of 
doing this, with the lead poffible Error, I think 
will be as follows. 
Infteadofthe ufualSlipsor GufTets,as isthemanner 
of Globe*makers,which are comprehended between 
two Meridians at fome Diftance, and are form’d only 
tentatively and mechanically, without the Help of 
any juft Theory, we may divide the whole fpheri- 
cal Surface into parallel Portions, or Zones; that is, 
into Parts terminated by two Parallels to the Equa- 
tor, at the Diftance (fuppofe) of ten Degrees. As 
if the firft of thefe Portions, or Zones, were at the 
Equator itfelf, and extended to five Degrees of La- 
titude on each Side of that Circle, the fecond Zone 
would be at the Parallel of ten Degrees of Latitude, 
and would extend to five Degrees of Latitude on 
one Side, and to fifteen Degrees of Latitude on the 
other Side of that Parallel, andfb of the fucceeding 
Zones. 
Now r 
