Bauhaus-Universität Weimar

Titel:
Experimental Psychology: A Manual of Laboratory Practice, Vol. I: Qualitative Experiments, part 2: Instructor's Manual
Person:
Titchener, Edward B.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit11938/270/
236 Visual Space Perception 
of the lens ; it is a real, inverted image, visible as a small spot 
of brightish light. 
When the subject accommodates for the near point, the mid¬ 
dle image becomes smaller, and ap¬ 
proaches the corneal image ; when he 
accommodates for the far point, it grows 
larger again, and retires from the corneal 
image. No change at all is observable 
in the corneal image itself ; and none, or 
hardly any, in the image from the pos¬ 
terior surface of the lens. It follows 
(from the laws of reflection in convex mir¬ 
rors : Helmholtz, 133) that the essential 
thing in accommodation is the change in 
convexity of the anterior surface. — 
This is the experiment in the rough. The observations are 
easier to make, and more striking, if two images are reflected 
from each surface ; since in that 
case the two middle images ap¬ 
proach each other at the same 
time that they grow smaller. 
We may employ for this purpose 
a vertical screen with two win¬ 
dows, behind each of which 
stands a lamp or candle (Helm¬ 
holtz, 132); or a single flame 
and a horizontal mirror {ibid.)] 
or Helmholtz’ phacoscope (Gk. 

    

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