The fantastic Give-A-Show Projector! I had forgotton all about this!
We used to sit like good children while mum and dad would show us the slides on our living room wall. We had lots of different types of slides. The Give-A-Show projector worked from batteries and had quite a good clear picture, although I do remember dad having to get the position and distance JUST right. I would love to get me another one - sad I know!