Under sitt opphold på Rjukan fikk Norolf Henriksen kontor på laboratoriet. Han og en medstudent arbeidet med studier av inndampingsanlegg for kalksalpeterlut ved hjelp av varmepumpe. Diplom-arbeidet vakte stor interesse blant ingeniørene, men den mektige «Fader Enger» fikk de aldri hilse på. (Foto: Hydro/NIA).
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