IF only a few try a tripod and taping the slides to the window. Otherwise a simple cardboard box with a suitable 35mm hole cut out with a shelf for the slides to sit on, a desk lamp can be enough light but watch the colour. I tend to dig out the 35mm projector and photograph the picture projected onto my screen, get quite good results that way.
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People sell devices that fit flatbed-scanners for negatives, Google that. It's a device quite simple in which you have a (?45 degree) mirror reflecting light back through the film. Otherwise there are devices specifically designed for slides. If you've got a scanner let me know. L