Mr. Jeflfop to Mr, Wray. 3 5? 



fince, by my Lord Devon/hire's Order, who fcnt his 

 own Servants by turns. 



Having lately perufed, amongft the Philofophi- 

 cal Tranfa£tions, my Lord Brounkers Quadrature 

 of the Hyperbole, which pretends to have done 

 it only as near as you pleafe; and reflecting upon 

 fome things that I had formerly confider'd, I grew 

 almoft confident that it might be done truly and Geo- 

 metrically by one that would go to work with it the 

 right Way. I am not fo foolifh as to think, that I 

 who pretend not to be skilled fo much as in the Ele- 

 ments of Conic's, can add any thing unto what they 

 have done in their own Way, in which they have 

 been fo long converiant. Yet, in my firft Entrance, 

 there was one thing came into my mind, which all 

 thofe who have written upon this Subjeft have either 

 not taken notice of, or negle&ed, which will go a 

 great way in the Bufinefs : And that is this. 



Si dati fint duo coni Ifofceles ejufdem altitudinis$ 

 axem habentes communem,&fecentur hi coni a piano 

 axi parallelo, poftibile eft exhibere Quadratum, quod 

 eandem habebit rationem ad fpatium interceptum in- 

 ter lineam hyperbolicam, qua? eft in fuperficie majoris 

 coni, & lineam hyperbolicam quse eft in fuperficie mi- 

 noris coni ita fe£ti, quam habeat linea fiyperbolica 

 minoris ad lineam hyperbolicam majoris coni, addita 

 linea hyperbolica minoris coni. 



If you think this worth your Confideration, I fhall 

 fend you the Demonstration at a more convenient 

 Time. 



I am ■ , 



Broomhall, Nov* TOUT affectionate 



2 5- Friend and Servant^ 



Fra.Jeflb]X 



Mr, 



