Abstract: An apparatus and method for recognizing malfunctions of a heater operated with liquid fuel uses output signals of a function testing circuit to be displayed in coded form. By this method it is possible to identify, on a display, which is preferably an operating state indicator light, a disturbance. The type of disturbance and hence the trouble spot can also be displayed without any further expenditure.

Abstract: An electromagnetically operated fuel feed pump has an electronic control which comprises a phototransistor circuit with a delay element and a threshold switch. With this control a wear-free operation of the control is possible in a space-saving arrangement.

Abstract: This disclosure relates to floor, wall or ceiling construction which includes a pair of plates having top and bottom surfaces and a relatively long peripheral side surface therebetween, each peripheral side surface including a first surface portion immediately adjacent each associated top surface, the first surface portions being disposed in relatively closed spaced side-by-side relationship to collectively define therebetween a relatively narrow guide groove of a predetermined width for receiving therein a cutting tool and of a length corresponding to the length of the peripheral side surfaces, each first surface portion merging with a second surface portion, the second surface portions being disposed in comparatively further spaced side-by-side relationship and the first surface portion is to define therebetween a relatively laterally wider adhesive-receiving channel, a cover across the top surfaces of the plate in spanning relationship to the narrow guide groove, an adhesive between the cover and the top s

Abstract: A ventilating and air conditioning arrangement, especially for large office rooms, comprises at least one first air outlet through which a low speed air stream emanates for providing a basic climate in the room and at least one second air outlet for a second air stream, the volume and preferably also the direction of which is regulatable, to provide a zone having an individual climate differing from the basic climate, and in which the at least two air outlets are connected to each other to form a unit, which may be mounted on a desk or at any other convenient location in the room.

Abstract: A method for ventilating or air conditioning a room or occupied space comprising dividing the air supplied to the room into a principal air volume appropriately fed into the room at various spots to establish the primary or overall climate of the room and into another, usually lesser volume distributed at one or more work places or zones regularly occupied by individuals, with adjustment of the latter volume and its flow by the individuals to establish a respective local or zone climate for their specific needs; a room arrangement or building structure affording air conditioning or ventilating by the described method; and specific particular adjustable air outlet heads adjustable without tools preferably in universal fashion at individual work places or zones of occupation.

Abstract: A heating system for a vehicle passenger compartment provides a heat reservoir wherein heat energy from the engine exhaust means may be stored until needed to heat the passenger compartment, for example, when the vehicle is operated with a cold running engine. The reservoir absorbs the heat from the engine exhaust pipe through absorption means which may include sodium as a heat transmission medium and which operate to limit the heat transfer between the exhaust system and the reservoir to levels of exhaust gas temperature above a predetermined minimum. A vacuum chamber surrounding the heat reservoir may have a heat transfer fluid, such as freon, introduced therein to transmit the stored heat to air which is to be supplied to the vehicle passenger compartment.