Three-Dimensional Photography - Principles of Stereoscopy

THE STEREOSCOPE 55

The writer has never experienced either of these types of-cou-
pling, and for many years the failure of tyros to see the stereo
image was a puzzle. There was always the possibility of the ab-
sence of stereopsis, but this was not really a satisfactory explana-
tion. Only after some period of time spent in study did the facts
reveal themselves. Unfortunately for our pet slogan, the stereo-

Fig. 3-14. Drawing stereoscope used to develop better stereopsis.