( « 4 9 ) 
Corol. i. The Image N will continue in the fame 
Point ; altho’ the two Specula be turn’d together cir- 
cularly on the Axis R, fo long as the Point A re- 
mains elevated on the Surface of B C : provided they 
retain the fame Inclination. 
Corol. z. If the Eye be plac’d at L, (the Point 
where the Line AF continued cuts the Line G K 5) 
the Points A and N will appear to it at the angular 
Diftance A L N, which will be equal to A R N : 
For the Angle ALN is the Difference of the Angles 
FGNandGFL; and FGN is double FG I ; and 
G F L double G F R, and confequently their Difference 
double FRG or H R I : Therefore L is in the Cir- 
cumference of a Circle paffing through A, N, and R. 
Corol. 3. If the Diftance A R be infinite, thofe 
Points A and N will appear at the fame angular Di- 
ftance, in whatever Points of the Scheme the Eye and 
Specula are placed : Provided the Inclination of their 
Surfaces remain unaltered, and their common Section 
parallel to itfelf. 
Corol. 4. All the Parts of any Objects will ap- 
pear to an Eye viewing them by the two fucceffive 
Reflexions, as before defcribed, in the fame Situation 
as if they had been turn’d together circularly round 
the Axis R, keeping their refpedive Diftances from 
one another, and the Axis, wkh the Direction H I, 
i. e. the fame Way the fecond Speculum DE reclines 
from the firft B C. 
Corol. 5. If the Specula be fuppos’d to be at the 
Center of an infinite Sphere ; Objects in the Circum- 
ference of a great Circle, to which their common Sec- 
tion is perpendicular, will appear remov’d by the two 
U z Reflexions, 
