Heinrich Joachim Meldahl was born in Copenhagen, Denmark. He was the son of Christen Larsen Meldahl (ca. 1742-1782) and Cathrine Wendorf (1742-1807).
From 1804, Meldahl was employed as a designer and operating engineer by Jacob Aall at the Næs jernverk in Aust-Agder, Norway. It was his task to lead production and deliver drawings to new product models. From 1806-07, Meldahl returned to Copenhagen for further education in drawing.
In 1811, he returned to Denmark, where he was granted permission to establish an iron foundry at Vesterbro. Production included agricultural tools including plows and harrows as well as stoves and ovens similar to those from Næs.
He was married to Benedicte Louise Hansen (1796- 1845) and was the father of Danish architect Ferdinand Meldahl (1827-1908).
- Terje Bodin Larsen. "Henrich Meldahl Og Nes". vineta.no. Retrieved September 1, 2017.
- Hamran, Ulf. "Heinrich Meldahl". Norsk biografisk leksikon (in Norwegian). Retrieved 28 February 2012.
- Mats Linder. "Henrich Meldahl". Store norske leksikon. Retrieved September 1, 2017.
- "Meldahls Smedie". Visitcopenhagen.com. Retrieved September 1, 2017.
- Hakon Lund. "F. Meldahl". Dansk Biografisk Leksikon. Retrieved September 1, 2017.
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