Te eet Ae Oe SOS ee NG PER Ey Meee a eines ee Se ge ne” Py Rie aee oy =: 
J. LeConte on Binocular Vision. 9 
median lines n S,n’S’. It will be observed that these double 
images occupy precisely the position of those of an object at 
A fig. 9. Fig. 11, gives the relation of parts and the direction 
of the optic axes, when objects aa in the foregrounds of the 
ictures are combined and seen at A, and fig. 12, the visual 
result. To combine aa (fig. 11), bd do not slide by each other, 
presentation (fig. 12) the exact position of bd’ of the scene, is 
determined as 5 
the ray lines. 
_ The phenomena of combination by squinting is represented 
in figs. 13,14, 15, of which fig. 13 represents the actual relation 
oe and the direction of the optic axes when foregrounds 
_ ease of combination by squinting, the two images of the card 
do not slide over each other inward, as in the stereoscope, but 
oo = 
