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Haxel had recognized KO’s experimental skills in an advanced lab course. Since this was outside KO’s main interest at the time, he was initially reluctant to do so. The large number of ocean 14C samples and the high demands on precision (< 3‰ error) required by the small 14C gradient in ocean deep water lead to a new design of the low-level CO2 gas counters of the Heidelberg laboratory: 9 counters of 4 L each were mounted in a system of 5 flat guard counters (Schoch et al. 1980). [...]in the late 1950s KO saw the key role of 14C as atmospheric tracer in two aspects: (1) bomb 14C to study atmospheric mixing and gas exchange with the ocean, and (2) the quantification of fossil fuel in anthropogenic fluxes of CO2.