A giant N2-jacketed liquid-He metal dewar built in this laboratory is described for housing a 53-in. superconducting magnet used in the human FONAR [Focusing of NMR image within sample] experiments. This dewar is 10 ft tall, 6 ft wide, 18 in. deep and weighs 1 1/2 tons. It consists of the main magnet hoop connected through a demountable gooseneck to a liquid He reservoir tank.