I ^7^ 3 
be placed nlgher thereto, then the Glaffes Tom , the Objeds 
are ereft, it the Eye be placed juft ia the FocuSy the Objeds 
are neither ereO: aor reverfed, but all in conflifion between 
both ; and if the Eye be placed further from the Glafs than 
the Focus , the Objefts are reverted. I mean here diftant 
Objeds, the Rays flowing from any point whereof may be 
counted to come parallel towards the O^jec^-glafs, for fueh 
Objeds we are to confider when we fpeak of looking thro^ 
Te/e/co^es, 
This being laid down, I affert. Secondly, that the 0^- 
jet^-glafs of a Telefcope reveries the Objeft, both to the E^e- 
G/^^ and the Eye, that looks through it: Vo^ thtEye-gUfs 
is placed farther from the OhjeB^glajs than is the Focus of the 
Obie5t'gkfs. But the Eye-gUjs does nothing towards the Rec* 
tification or Reverfioh ; the Eye being placed juft in it's 
Focus. Thus we fee that the Reverfing of Objefts in a 
Tele f cope two Convex-glalTes proceeds wholy from the 
OkjeSi'gUfs and its pofition, and the Eye-glafs has nothing 
to do in the Affaire ; for were the Eye it lelf in the place of 
the Ey f -glafs it would fee the Objeds inverted thro' the fin- 
^tObje^l-gUfs. ' ; 
I come now to confider the fecond E^^r^/^/} placed after 
the firft l^ye-glafs. ( the firft Eye-gUfs being that next the Oh- 
jeS^-gUfs ) And here it is manifeft that placing this as it 
ought in a Telefiofe^ if we place our Eye nearer to this mid- 
dle FLye-gUfs than it's Focus y the Eye fees the Objeds inver- 
ted and confufed .- Place the Eye in the Focusy it lees the Ob- 
jeds all in confufion,neither ere£t nor reverfedjfor here agaijp 
there is a diftinft Reprefentationof the Objeds to be recei- 
ved on a piece of Paper, as in the Focus of the OhjeCt-glafs i 
and the Eye being placed at any time at this place ( which 
is ufually called the Dijtinct- Bafe ) fees all in confufion. But 
then let the Eye be placed farther from this middle GJafs j 
then its Focusi^ ^ov fo is the third or immediate Eye-glafs jit be- 
ing alwayes diftant from the middle Eye-glafs^ the Aggre- < 
gate of both their Ffd) it perceives the Objeds ereft and ji 
confufed* " Laft- 
