It takes a curved panoramic type image through three pinholes in the camera and the images overlap, thus a blended image. Unfortunately I'm unable to upload a photo of the camera or another example.
@PhotoBob, Interesting. I never heard of such a thing. When I did an online search, I saw a lot of websites talking about to simulate a Blender Pinhole camera using software, but I did not see anything about an analog camera. Thanks for your reply.