Abstract: A monitoring installation in which a monitoring unit having a monitoring device is suspended from a trolley that rolls or glides along a rigid path by at least one traction rope or cable which pulls the trolley along the path.

Abstract: In order to combine an optimal deterrent effect with monitoring possibilities a monitoring installation includes a plurality of rotatable monitoring units, which units have two parallel slot shaped openings. These openings extend along a bottom circular sector. A camera lens and a loudspeaker arranged in a louvre are located in every slot shaped opening. These are traversable at least over part of the extent of the circular sector. A potential thief is given the impression of an uninterrupted monitoring. He is deferred further by the loudspeakers. These can at the same time be used for transmitting alarms, announcements or customer information.

Abstract: The apparatus for optical monitoring facility, wherein two circular elements are swivel-mounted at a support section. A television camera is fixed inside the first circular element, whereas the second circular element carries two dummy lenses. The apparatus is installed in a cover by which only the camera lens and the dummy lenses can be seen from the outside. The first circular element can be swivelled by a swivel motor, whereas the second circular element is swivelled in the same way by means of cables. The apparatus can be rotated around its vertically fixing axis by a motor. A control equipment allows the adjustment of the camera lens and of the camera's position. The control equipment comprises a programmable microprocessor in which an observation's sequence can be stored. The apparatus is arranged in such a way that the observation through only one lens cannot be recognized from the outside world.