Background Story: While visiting the museum with my friend, there was a 'what is it?' contest where you had to guess what the tool was. Later in the museum, we saw the exact same tool in the medical area (with all of the old scalpels and aged bottles of medicine). They may have put it in that section just because it looked like a surgical tool, meaning that there is a possibility that it could have been used for something else.
one picture is worth a thousand words.
I believe second one is a circular saw used to cut the skull bone. It had teeth around the outside and would be connected to a power source to spin fast.
