Sandgren Slide Difficulties

I realized I forgot to write a blog post about my shift this afternoon. I began scanning the Nelson Sandgren slides, however I'm having the same trouble I did at the beginning of the year where the scanner doesn't recognize the shape or location of the slide and the image comes out wrong. I was able to fill out some information on the spreadsheet but I'm going to have to redo the thirty slides I tried scanning today. I'll look back through old blog posts to figure out what I did to make it work correctly. I think I might have had to scan fewer at a time and place them in a certain position in order to get the scanner to cooperate.