Abstract: The device comprises on the one hand an elongate scale (7) consisting of a succession of magnetic north poles and south poles, and on the other hand a measuring head (9) with at least a first and a second magnetic field sensor (21, 23) which are subjected to the effect of a magnetic field which alternates as a function of time due to the alternating passage of north poles and south poles during a displacement (15) of the scale in its longitudinal direction with respect to the measuring head. The two magnetic field sensors (21, 23) are arranged so that they are always situated opposite one and the same point on the scale (7), the first sensor (21) being sensitive to variations in the magnetic field component extending parallel to the longitudinal direction of the scale (7), the second sensor (23) being sensitive to variations in the component extending parallel to the connecting line (19) between the scale (7) and the measuring head (9).

Abstract: Disc player has a frame (11) which supports a turntable (13), and a loading mechanism comprising a movable drawer (21) which carries a disc support (29) for transferring the disc to the turntable. The loading mechanism further comprises a vertically movable disc-pressure member for pressing the disc onto the turntable. The frame carries strips (23) and rollers (25) for guiding the drawer movement and an electric drive unit (61) which can be coupled to the drawer by means of at least one friction wheel (65A, 65B) which is supported in the frame and which can be driven by the electric drive unit, and by a drive element (69) on the drawer which is engageable with the friction wheel.