Improvement in the Lenticular Stereoscope. 405 
ary pictures being mounted at too great a distance from each 
other for the power of the fixed lenses to unite them; but the 
same result may be the effect of an individual peculiarity in the 
observer, the eyes being naturally wider apart than is common. 
to see, therefore, that a stereoscope which will enable us to see, 
equally well, different views which vary more than an inch in the 
amount of deflection, and answer perfectly to unite pictures 
Which are separated from each other a certain, uniform 
increase the distance between the lines upon each successive card 
