toroid t within its case contains a number of coil segments cs spaced by air gaps g as shown in fig2 it is an important characteristic of the invention that the field not be greater than 20 gauss in the area of the diseased organ do after much study it has been found that it is important that voltage be supplied to the toroid winding in a pattern demonstrated in fig3 the voltage supplied must repeatedly build up steeply hold and then deteriorate steeply and so that there are thus created a series of spaced working plateaus p of pure dc current it is preferred therefore that in the duty cycle the wave form of the pure dc voltage involved be virtually of rectangular shape with the abruptly rising r and abruptly falling d sides of the wave form comprising sides of a rectangle in between two such duty cycles there is an off cycle as an additional characteristic further study has indicated that it is important that the movement of the field along the diseased limb for instance be toward its distal end thus for instance when treating a patient 39 s hand as shown or knee as the diseased organ the magnetic lines of the field f in the area of the organ should move toward the end of the appendage remote from the torso this is achieved by supplying voltage of proper polarity to the coil leads of the toroid t as shown in fig2 the target diseased organ do is supported to be in position eccentric to the central flux portion of the magnetic field within the toroid this can be accomplished by a shapeable fiber support pillow sp of cotton or the like which need not.