Abstract: The invention concerns a measuring instrument for measuring phase shifts in four terminal electrical networks, where the network whose phase shift is to be measured is connected into the feedback circuit of an R-C phase shifter oscillator, and where the generated frequency depends on the phase shift of the four terminal network and of the RC-phase shifter, and where the circuit is so dimensioned that the following oscillation conditions are satisfied:.phi.(.omega.) + .phi. = 0 (or integral multiples of 2 .pi.)(1).vertline.F (.omega.).vertline..multidot..vertline.H.vertline..multidot.A = 1 (2)where .phi. = phase shift of the network whose phase shift is to be measured.phi.(.omega.) = phase shift of the R-C phase shifterF (.omega.

Abstract: In ordr to measure deformations of magnetic material which is being cold-rolled a plurality of magnetoelastic stress-sensing transducers are used, each of which has two U-shaped magnetic cores provided with windings and crossing each other perpendicularly. The cores are mounted with their pole surfaces spaced from the strip being rolled and with the cores making an angle of 45.degree. with the longitudinal direction of the strip. The individual transducers are screened from each other by a screen of magnetic material positioned axially symmetrically around each transducer, so as to prevent adjacent transducers from magnetically affecting each other except through the field in the measuring object and the leakage field in the air gap between the measuring device and the object. The transducers are mutually displaceably arranged along a line crosswise of the strip. Between the transducers and the measuring object there is a protective plate of non-magnetic material with very high resistivity.