Three-Dimensional Photography - Principles of Stereoscopy

STEREO MOVIES 283

facts reveal the nature of the screen to be that which was long ago

developed in this country and later abandoned as impractical.

It must be kept in mind that stereo projection per se is an ac-

complished fact, but the practical objection lies in the fact that in

Fig. 19-7. The simplest stereo movie outfit. An altered Stereotach used
with the 16mnz Cine Kodak.

America the system will never be considered commercially prac-
tical as long the the spectator has to do anything to aid in the re-
ception of the stereo images. This means that individual viewers
cannot be used, no matter what their nature. It means that special
positions cannot be tolerated.
It seems strange that anyone should object to wearing a pair of
light spectacles which are no more uncomfortable than any pair
of lightweight spectacles or sunglasses, yet that is the only thing
which stands in the way of the general adoption of wholly suc-
cessful commercial stereo motion pictures!
One older system made use of a rotating shutter for each spec-
tator, either fastened to the back of the seat in front of the spec-
tator, or held in the hand. These shutters were synchronized with