Abstract: The invention relates to a method and a device in the manufacture of an optical fibre (11), in which manufacture a fibre preform (12) is placed vertically in a drawing furnace (10) or the like, in which drawing furnace (10) the preform (12) is heated in a heating zone in such a way that a thin fibre (11) is formed of the molten zone (16) forming at the lower end of the preform (12) by means of gravity and/or downwards drawing of the fibre (11), and the forming fibre (11) is guided to cool down in a controlled manner in an extension tube (19) following the healing zone. According to the invention, after said heating zone, on the path of the molten or still partly molten fibre (11), the extension tube (19) is provided with a thermophoretic collector (20, 30, 40) which comprises one or more cooled means (21, 31, 41) to thermophoretically deposit, on its surface, impurities contained in the gas flow (18) surrounding the fibre (111).

Abstract: A drawing furnace or the like for manufacturing optical fiber preferably of a vertical fiber preform, which drawing furnace includes at least a preferably tubular heating element surrounding the fiber preform for heating the fiber preform, an outside insulating layer of the heating element, a frame part of the drawing furnace in order to place the heating element and insulating layer in the drawing furnace, and a cover part in order to close the area between the heating element and the frame part to insulate the insulating layer from the gas flow surrounding the fiber preform.

Abstract: A formed piece comprises a substantially cylindrical outer surface layer of sheet material extending along a longitudinal axis of the formed piece from a first end to a second end of the formed piece, and inner layers of sheet material within the outer surface layer randomly arranged and creating air gaps between at least a portion of the inner layers. The surface layer and inner layers of sheet material are twisted around the longitudinal axis of the formed piece and along the length of the longitudinal axis.

Abstract: The present invention concerns a procedure and apparatus for controlling and maintaining air currents or equivalent in an air-conditioning installation or equivalent. The air-conditioning installation comprises one or several air-conditioning machines (P) for producing the desired flows, and one or several duct systems for conducting the flows into the desired room spaces (H.sub.1,H.sub.2 . . . ) or equivalent and/or out from the room spaces (H.sub.1,H.sub.2 . . . ) or equivalent. The duct systems consist of requisite trunk, zone and room duct systems (R,Z,C). In the procedure the air flow rates required at any given time in the air-conditioning system are determined on the basis of the air temperature and/or air quality and/or air noise levels and/or air pressure conditions and/or other similar factors. On the basis of the respective air flow rates determined by calculation, a combination of the set values for all control members (S.sub.1,S.sub.1.1,S.sub.1.2 . . .

Abstract: Object identifying device, e.g. a bottle receiving device, comprising a transport apparatus for transporting the objects such as bottles, an identifying device with a data processing unit for identifying and accepting bottles having certain given shapes, and a recording device for recording accepted bottles. The identifying device comprises a principally stationary illuminating device for illuminating the bottles, a detector for examining the bottles, and a conveyor for moving the bottles past the detector. A mirror system is interposed between the illuminating device and the detector, with which the optical length of the entire system can be increased without increasing the structural dimensions thereof.

Abstract: Apparatus for identifying and recording bottles and/or bottle hampers utilizes a light source for illuminating a target being examined, such as, for example, a bottle hamper and/or the bottles therein. A camera momentarily examines the target. A conveyor transports the target past the camera and the light source. The image produced by the camera is transmitted to a data processing unit, after it has been transformed into digital signals, for identifying the target. A recording device records the target. The camera is a semiconductor matrix camera and the light source emits a lineal light bar and the camera and the light source are so disposed in relation to the conveyor that the light emitted by the light source is reflected from the target under examination on the conveyor to the camera.