rouse: the visual perception of distance. 



"5 



Table IV. 



Tne curves in the following diagram show the actual error for 

 distances marked below: 



E)~ror. 31TU , Both 



JJiogrom I. 



Heal Distances 



2 Both (free). 

 1354 13 



*Due to approiifliing curtain at known distance. 



Below is a plot showing /fv centu))i of errors (omitting first two 

 positions, where close view and some imperfections of method en- 

 abled subjects to overcome tendencies seen in other places), 

 fiafc pe/' vnituin. j^ 



Diagram BE 



Real Distance. 



Both. 

 Lefi. 



Right. 



*Due to approacliing curtain 

 at known distance. 



wa n J3fi 15 



Both (free). 



The above shows that the error has a strong tendenc}- to increase 

 as the distance increases, with few exceptions. 



