The light bulb in the microfilm machine is too dim, but also too hot! Tabby won't touch it without a protection.
Some kind of cloth would help.
Go talk to Edna about the towel.
Use the towel on the old light bulb. Find a replacement bulb.
Go check the exhibition.
The statue is holding a light bulb. Tabby should take it if you have opened the microfilm panel and tried to take the light bulb.