They needed a special mount (http://en.wikipedia.org/wiki/Stereo_Realist), which is basically the same principle as a ViewMaster, but different execution.
Back in the '80s my dad had a camera that had 4 lenses and was supposed to make a sort of lenticular type of image when you sent the film in for processing at a special lab. I never actually saw any pictures from it because the one time he used it, the lab lost the film and my dad just gave up on it after that. He asked a couple we knew if he could take pictures at their wedding to try it out and those were the photos that got lost, which was weird, because when my dad called to tell them, the bride said it was okay because the marriage had been annulled anyway. Okay, then.
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