that only one of the coils 30 will be energized at any given time and that its associated pole piece will thus be a unique source of magnetic flux it is not intended to preclude operation in which two opposed coils are concurrently energized in mutually reinforcing directions in such a case each of the two associated pole pieces would serve concurrently as a flux supplier and as a flux concentrator within the meaning of these terms as used above if in the foregoing description the first pole piece is to be regarded as energized i e by electrical energization of its associated coil 30 then that pole may be viewed at the source of the magnetic flux which is to be covered through the described flux path to the second pole serving in this context as a 34 flux concentrator 34 for cooperation with one of the flux receiving surfaces of the rotating magnet 26 because structural compactness is of vital interest in an indicator of the kind under consideration the present invention concerns itself with means by which magnetic relationships such as those just specified can be provided for each pair of opposed pole pieces without exceeding permissible dimensional limits this is accomplished in the embodiment of.