( 2,0 ) 
traded as before, or prefs’d clofe to the Globe; by 
which Means this Zone will alfb be compleated. 
And in the fame manner we are to proceed to the 
fucceeding Zones, ’till the whole Globe is cover’d. 
And the Method will not differ in any material Cir- 
cumflance, if inftead of a whole Globe, we are to 
conftrud any Part of it only, or what I here call a 
Spherical Map. 
To reduce this Theory to Pradice, and as a Spe- 
cimen of Spherical Maps, 1 have conftru&ed a Ter- 
reftrial Hemifphere to a Diameter of near 15* Inches: 
To which I have given the Name of the Britijh 
Hemifphere y becaufe it has Great-Britain in the 
Center, or rather at its Vertex. It is therefore 
adapted to the Meridian and Horizon of London , 
and exhibits one half of the Earth’s Surface, as it lies 
round about this City ; which is vaftly the mod 
confiderable Part of the whole Earth’s Superficies. 
The Longitude and Latitude of Places are here eafily 
known by Infpe&ion, and their Bearing and Diftances 
may be nearly eftimated : And all the Delineations 
are as accurate and particular as this fmall Radius 
would permit. I conceive therefore it may be no 
unfit Inftrument for inftruding Beginners, or for 
initiating young Minds in the firft Rudiments of 
Geography. 
FINIS, 
ERRATA. frumb. 439. p. 145. 1 . 15. dele Mr. before Pappus. 
P. 1 7 1 . 1 . 4. for Barrow , read William Barlow , 
L O N T> O i^.- 
Printed by W. Innvs and R.Manby, Printers 
to the Royal Socie ty , at theWe ft End of St. Paul's. 
MDCCXXXV1I. 
