But in the third edition of Halliday and Resnick it shows a picture of it in what appears to be a double bell jar.
So is there some history I'm missing? Was it originally in a double bell jar and then another bell jar added later?
Or maybe the outer "bell jar" isn't considered by some to be a true bell jar (since it doesn't have a knob at the top), and the Halliday and Resnick photo was zoomed into take a picture of just the inner two jars?