position with respect to detector coils 14a and 14b is thus changed ferrofluid 12 now links fewer of the turns of coil 14a and more of the turns of coil 14b the two transformers are unbalanced and their unbalanced condition is converted in the manner described above to a positive dc voltage on dc voltmeter 32 in fig5 the carrier 33 and inclinometer 10 are tilted to the left as the fig is drawn ferrofluid 12 again seeks the lowest portion of the loop and the coils 14a and 14b are shifted in location with respect to it the ferrofluid links fewer turns of coil 14b and more of coil 14a this condition generates the negative voltage appearing on dc voltmeter 32 fig6 shows an alternate embodiment of the invention which differs from that of fig1 in several respects corresponding parts are given the same reference characters with a prime 39 added the inclinometer 10 39 of fig6 has a loop 11 39 which is rectangular in configuration the axis of symmetry 13 39 employed as a line of reference for positioning parts on the loop is one which bisects the short sides of the loop detector coils 14a 39 and 14b 39 are wound on the loop on opposite sides of axis of symmetry 13 39 and.