Technikatörténeti szemle 19. (1992)

KÖNYVISMERTETÉS - Papers of the First „MINERALKONTOR” International Conference on the History of Chemistry and Chemical Industry (Veszprém, 12-16 August, 1991)

The measurement of the relative gas density using the measurement of the pressure difference between two gas-columns was used by Miiller (3) in 1890, but the first instrument based on the same principle was constructed by Arndt (4) in 1907 and called as Oeconometer. One of the oldest principle for gas-analysis is the measurement of the heat conductivity. The pioneer of the measurements using platinum wire containing cells and Wheatstone bridge arrangement was Schleiermacher (5) in 1888. However the first industrial analyser system was constructed by the Siemens Werke only in 1928 (6). For the continuous measurement of combustible gas components in air an instrument was constructed in 1921 by P. Gmelin (BASF) (7). The gas mixture was fed into a gasburner with constant rate and the radiated heat of the flame was focused to a thermocouple by which the temperature, i. e. the quantity of the combustible component was measured and registered. Nech Gme/infl.c.) 2. Instrument of Gmelin (7) for the continous determination of combustible gas components, 1921. The first mechanised volumetric analyser, which served for the periodic determinations and registration of the CO2 was constructed by the firma Ados (8) in 1890. The gas sample was taken periodically by a pump system, and the reduced volume of the sample was indicated by means of the position of a gas volume measuring bell, after the absorption of the carbon dioxyde in potassium hydroxide solution. The rithmic operation of the whole system was completely automatic and the instrument worked for long périodes. In the years 1906—1910 similar instrument, called Coometer (9) was produced in Budapest.