Configurations were designed using the electrolytic analog technique. In each case, there is a perfectly forcefree coil structure surrounding a region of central field and itself surrounded by a pressure-bearing diamagnetic wall. A maximum field appears against this wall. In practice, the wall can be simulated by a second, nonforce-free winding, or, in the case of fast pulsed operation, by a solid conductor of suitable small skin depth. (L.N.N.)