Abstract: An adjustable magnetic field for nuclear magnetic resonance diagnostic devices is provided by a set of extending ferromagnetic bars mounted in one of a pair of opposing magnetic pole members. A second set of extending ferromagnetic bars may be mounted in the other magnetic pole opposite the first set of bars. Adjustment of the magnetic field may be achieved either by moving the ferromagnetic bars or by controlling current flow through coils placed about at least some of the ferromagnetic bars. In order to detect the actual field strength and configuration to provide for the requisite control signals, an array of Hall effect detectors is employed.

Abstract: A cooking grill structure for utilizing the heat from deep fat fryers has a grill plate and a heat pipe extending into the cooking oil. Water is utilized as the liquid medium in the heat pipe, and condensation is distributed over the grill plate to provide uniform heating and prevent accumulated forces. Distribution is achieved by a relatively small channel that uniformly spreads the heat while preventing the production of unduly large pressure forces. To achieve greater transfer of heat from the cooking oil to the liquid medium in the heat pipe, heat transfer assistance approaches, such as fins or small diameter tubes to provide a flash boiler effect may be used. Also, more than one heat pipe may be used, and the grill plates may be interlocked to provide a continuous grill surface.