Abstract: The invention relates to a method for correcting a radiation error in atmospheric temperature measurement, particularly when using a radiosonde (1), a rocket, or a dropsonde, in which method at least one temperature measurement sensor is used in each measuring device. According to the invention, the state of motion of the sonde (1) relative to the ambient air is measured essentially simultaneously with the temperature measurement, and the result of the measurement result is used to correct the error of the temperature measurement.

Abstract: This invention relates to a connector to be used in the production of optical fibre preforms for connecting a process steam and gas supply pipe (1) rotatably to a silica tube (2) to be formed into a preform. To provide a structurally simple, rotating connection, the connector of the invention comprises a generally cylindrical body part (3) provided with a through-going bore for the supply pipe (1), said bore comprising one or more annular expansions for a ring seal or ring seals (6, 7) sealing the supply pipe (1) with respect to the body part (3). One end of the body part (3) is expanded to form an abutment for a ring seal (5) sealing the body part (3) against the inside of the silica tube (2), the connector further comprising a tightening means (8, 10) for pressing the ring seal (5) sealing the body part with respect to the silica tube (2) against its abutment to expand the seal radially.