File:Research plant for fertilizer production in Frognerkilen (cropped).jpg

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English: Norsk Hydro's research plant for fertilizer production in Frognerkilen, Norway: 5 kW and 30 kW ovens. From the trials that led to the Birkeland-Eyde method.

Eivind Boys Næss (probably) to the left and Kristian Birkeland.

Norsk Teknisk Museum Inventarnr. NTM C 23865
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Source https://digitaltmuseum.no/011014272224/norsk-hydros-forsoksfabrikk-for-kunstgjodselproduksjon-i-frognerkilen-5
Author Unknown photographer
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current10:09, 25 November 2017Thumbnail for version as of 10:09, 25 November 20171,565 × 1,749 (707 KB)Frankemann (talk | contribs)File:Research plant for fertilizer production in Frognerkilen.jpg cropped 2 % horizontally and 18 % vertically using CropTool with precise mode.

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