We found this Gaylord Library Fine Calculator in a file cabinet in the library. I couldn't find out much about this tool but from what I can tell you put a numbered tile in at the bottom of the device. The number would match up to that day's date and then you would use this thing like an old slide ruler to calculate the fine. Anybody know how old this thing is? I would guess from the 1950s or 60s. Thank you to Mike Price for the photo.