Fig. 3From: Liquid sodium models of the Earth’s coreSchematic and photos of the 3 m experiment. Left: a schematic of the experimental apparatus. Photos, clockwise from top center: the outer sphere; the inner sphere with shaft and lid; the inner sphere being lowered into the outer vessel, which is filled with water in this view; the bottom bearing and rotating fluid junction (allowing heating oil to be circulated in the jacket around the outer sphere)Back to article page