Abstract: In an echo-sounding recorder wherein received echoes are recorded on a common recording surface, starting from a common zero mark, by means of a recording member moving with uniform velocity, the echo-sounding recorder being switchable to different depth-measuring ranges, respective switching members operable independently of one another for setting the recorder to different main measuring ranges and to different offset measuring ranges, and a scale associated with each of the measuring ranges, the improvement therein includes a scale carrier carrying all of the scales in a common plane, the scale carrier being formed of at least two parts respectively displaceable vertically and horizontally relative to one another, a cover plate disposed in front of the scale carrier parallel to the recorder and formed with a row of windows spaced from one another a distance corresponding to the distance between divisions of the respective scales, the scale carrier being mounted for movement relative to the cover plate in t

Abstract: The record player has a turntable formed with an outer rim. A belt-pulley is mounted on the shaft of the turntable; another belt pulley is mounted on a pulley shaft parallel to but spaced from the turntable shaft. A belt connects the two pulleys. On this pulley shaft, a friction wheel is also mounted. The pulley shaft is mounted for movement in a plane normal to its elongation. A spring maintains the friction wheel in engagement with a motor output shaft via which the pulley shaft is driven. Normally, torque is indirectly transmitted to the turntable via the belt. However, all times when increased torque is temporarily required, the pulley shaft moves so that the friction wheel -- which remaining in contact with the motor output shaft -- engages the rim of the turntable to transmit additional torque directly to the same.

Abstract: Means and method of reducing the distortion or channel separation due to interference voltages between the reproduction channels in multi-channel reproduction of acoustic sounds in systems having at least two different channels are described. The steps are deriving a control voltage from the low and high interference voltages which occurs in a channel which is proportional to the magnitude of the interference voltages, and using the control voltages as an adjustment to control the distortion or channel separation. The control voltages may be derived from a single channel. The control voltages may be combined to yield a single control signal. Both equal-phase distortion and phase-opposition distortion may be suppressed.

Abstract: A display device having a rectangular area of variable shape and cross-section with a pair of movable line markers defining the horizontal boundaries and another pair of movable line markers defining the vertical boundaries, means for moving each pair of line markers to vary the distance therebetween to obtain the rectangular area of desired shape and cross-section. Simultaneous movement and regulated separation of pairs of line markers may be obtained by rotating elliptical cams connected to the line markers.