@DJHawkes.........Hi Dotty, I feel sure there is a way. Magic lanterns I know about because going back, some 60 years, I actually used one as my first Photographic Enlarger for 35mm film negatives.
It is my opinion that, if the glass slide is 'back-lit' from a lamp or window, a photograph of it can be taken with a digital camera and then transferred into a computer; from which it could be printed or 'burned' onto a DVD. Also I am thinking that the image from the slide could be scanned onto a computer/laptop's hard-drive.
At the moment I have to leave AB to do a quick 'flick-over' of car to present it in a reasonably looking condition for Servicing & MOT tomorrow morning. Later on today I shall do an Internet Search to see if there is anything on the Web which might help you.
Hans.