Abstract: A small gas turbine, in particular for powering airplane models, provided with a casing (3), a compressor rotor (1, 2), a combustion chamber (15-17) and a turbine rotor (5), the turbine rotor (5) driving the compressor rotor(1, 2) by a shaft positioned in a shaft tunnel extending through the combustion chamber (15-17) and surrounded by a helical fuel feed and vaporizing tube (22, 23), the combustion chamber (15-17) being defined by a cylindrical outer wall (15) and a frusto-conical inner wall (16) provided with combustion air intake orifices (19-21)the outlet side of the inner wall (16) of the combustion chamber extending into a cylindrical flow element (6, 7) forming an annular gap therewith, which in turn extends into the center opening of the turbine side guide vane ring (4) and is supported by the end (9) of the shaft tunnel (8), and the other end of the shaft tunnel (8) being secured to the casing (3) between the compressor rotor (1, 2) and the front wall (17) of the combustion chamber.

Abstract: An apparatus for checking gas analysis devices in respect of their sensitivity and their response and regeneration behaviour with respect to time, wherein a reproducible quantity of the measurement component is produced at a predetermined production rate, for a period of time which is guided entirely or at a constant proportion as a concentration pulse to the measurement element of the gas analysis device. For the production of the measurement component a chemical or electro-chemical reaction or even a thermal reaction is used. The time interval can then be conveniently controlled. A decisive advantage with toxic measurement components is that the gas production takes place in all cases for only a short time during the test procedure.

Abstract: A method for checking gas analysis devices in respect of their sensitivity and their response and regeneration behaviour with respect to time, wherein a reproducible quantity of the measurement component is produced at a predetermined production rate, for a period of time which is guided entirely or at a constant proportion as a concentration pulse to the measurement element of the gas analysis device. For the production of the measurement component a chemical or electro-chemical reaction or even a thermal reaction is used. The time interval can then be conveniently controlled. A decisive advantage with toxic measurement components is that the gas production takes place in all cases for only a short time during the test procedure.

Abstract: In a process for determining the total mercury content in samples of effluent water, the sample is collected on a sample collector where it is evaporated at 1000.degree. C before it is decomposed in a pyrolysis zone at 1000.degree. to 1200.degree. C. The mercury in the liquid sample is thereby expelled as vapor and together with carrier gas it is conducted over a metal sheet which absorbs the mercury and concentrates it. The concentrated mercury is then expelled by heating the metal and transferred by the carrier gas into a mercury absorption photometer where it is determined quantitatively.