Mr. Wildbore on 
either — or — r= o, that is, when either b 1 — c 1 or cf^b 1 . 
ac 7 t 
In like manner it will alfo be found, that = 
. € z ■_ 2* 
BC , ^ BA / € s T 2 4T 0 2 \ * 
’ 5 Vba bc ba bc/* 
BA 
e — 
I — 
& 
z 
e — 
2 
BA ' BC BC 
when /3 = o, or the pole of the momentary axis crofles BC, <T = 
A3 2 * 
. € 2 A 2 
BA X BA BC 
€ : 
i 2 a 5 * 
.Z ^ S' 
e — - — e — 
and to have this poffible it is neceflary 
BC ’ BC 
that CC a be greater than A&% and it is above determined, that 
under the fame limitation Z muft alfo crofs BC. 
C 2 
Again, from the equation 
e i _ 
1 4 -— I 
X AC BA 
** BA , , C 2 , < 
e BA ^ BA + 
* (£ 2 y 2 
3 s , and when y = o, or O crofles 
e AC* C 7 * 
CA, §* = — , let — and then <T = m 2 + — ~h>or m z - 5“ — 
— — which is the very equation brought out by a different 
method in the firft fcholium to the fixth propofition above. 
And if n = — = the cof. of the arc of which in is the fine, 
e 
it will be found in the very fame manner that = »" + 
7?V _ By- 
AC A 
£ y 
AC ~ BC A 19 v ~ ? ' AC* 2 C 
. Moreover, becaufe A x H z — x L =zBy z rCxC 2 - s 2 z=: 
A 3 2 COT 
A3 2 
By 2 + A/ 3 2 By 2 + Cr ? COT 
A x a 2 — £ 2 jG z == = Cx c ~ 
-as — By 2 -f Aft 2 » By p = — B X but 
k C/ By 2 -fC^’ 'xx~ * 3 ftyJ * 
& 
* v i 2 
xx+A; = e z a conftant quantity} therefore as x i + A + 
