, j ft? ) 
•re&angled Cone whole Altitude is equal to A R. And its 
Curve Surface will be equal to half the Surface of a 
Globe whole Radius is A R. So that if the Curve be 
continued both mays infinitely (as its Nature requires) the 
whole Surface will be equal to that of a Globe of the fame 
Radius A R. 
The Defcription of the Rular and Wheel, Fig, z. 
is fufficient for the Demonftration of the Properties of 
the Curve : but in order to an adfual Conftru&ion for 
Ufe, I have added Fig , where A B is a brafs Rular 
wh the little Wheel, which mufl be made to move free- 
ly and tight upon its Axe (like a WatclkWheel) the Axe 
being exactly perpendicular to the Edge of the Rular. 
s reprefents a little Screw-pin to fet at feveral Diflances for 
different Radii, and its under End is to Aide by the Edge 
of theotherfixt Rular. f is aScud for convenient holding 
the.Rular in its Motion. 
Note > thefe- Properties of this Curve by the Name 
c/ia TraArice, are to be found in 4'Memoire of M • Bomie 
among tbofeof the Royal Academy of Sciences for the Tear 
1712,^. but not pub lift'd till 1 7 1 5 : Whereas this Paper of 
Mr.' Perks veas produced before the Royal Society in May 
1714, as. appears by their Journal. 
VL An Account of a fcook^ entituled Methodus Incre-> 
mentorum, AuElore Brook Taylor, LL,D. Sc 
R. S. Seer. *By the Author. 
W H EN I iapply’d my felf to conftder throughly 
the Nature of the Method of Fluxions, which 
has juftiy been the Occafion offo much Glory to its great 
Inventor Sir Ifaac Ne*ton our mo ft worthy Prefident, I 
fell by degrees into the Method of Increments, which I 
have endeavour’d' to explain in this Treatife- For it being 
the Foundation of the Method of Fluxions that the Flux- 
ions 
