158 | S. Rowley on Vision. 
istance f inches 
the near end of the rule, that distance for eyes 2,4, ine 1 
seat will be accurately found, Now fix the axes of the eyes : 
sis ‘ sn the | 
uence of the principles of the proposition, as illustrated in : 
i i : holds, asi actual practice, and that bere q 
are fixed upon the images of an object placed as @ oi a 
point at A, the left eye’s visible image of an sels a ore He | 
a point at B in the line FB, is seen a little beyond w : 
Tight eye’s visible image ‘ 
of an object placed as a 
oint at D in the line B 
wn through F’ and d | , G 
is seen, both im the same 
line of no variation. It 
is obvious by the propo- 
sition that itought notto 
affect the “conjunction” 
_ of the images, whereso- 
ever in the line passing 
>| 
% 
is 
ee ee ee ee 
tal 
_ place, the axes represen- F} 
ted by CB, O'B, fig. 2. eer | 
